One is African and supported by trigonous ovary in transverse section.
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In superior view the fruits are markedly trigonous with three obtuse angles.
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It is very much flattened in paspalum scrobiculatum, but somewhat trigonous in Digitaria sanguinalis.
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Grain is sub-globose, oblong or trigonous, closely invested by the glume and its palea.
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Grain is oblong, obtusely trigonous, or concavo-convex, red-brown and rugulose on the ventral side.
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Flowers in Cyperoideae usually have a trimerous superior pistil consisting of a trigonous, unilocular ovary, a long single style and three stigmatic branches.
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The perigynia (also called utricles) are green to brownish, long, contracted to a beak long. Stigmas are 3 and achenes trigonous. 2n = 68, 70–72, 74.
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Stigmas 3 (occasionally 2 on 0-5%(-15%) of perigynia that have viable achenes). Achenes trigonous (lenticular if stigmas 2). Inconspicuous Carex klamathensis is easily confused with Carex hassei, which typically has 2 stigmas per flower and lenticular achenes. Unfortunately, populations of Carex hassei sympatric with Carex klamathensis in the Klamath Region often have a mix two- and three-styled flowers that produce viable lenticular and trigonous achenes, respectively.
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It reaches some 2,5 m in height, is trigonous with wiry, drooping yellow-green leaves that are narrowly sword-shaped and keeled. They have scabrid leaf margins armed with minute teeth pointing to the leaf apex. The flowering stems are erect and triangular in cross-section, standing well above the leaves. Nutlets are small and trigonous, often crowned by a persistent style, and are consumed by the Chacma baboon.
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Up to 2/3 of the flowers may produce trigonous achenes.Wilson, B.L., et al. (2008). Field Guide to the Sedges of the Pacific Northwest. Oregon State University Press.
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It is distinguished by its short, stout and trigonous stems and by the irregular pollen aggregates of more than eight grains. It is a poikilohydrous and poikilochlorophyllous type of resurrection plant.
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Inflorescence is fascicled or racimed with pale pedicels which are long. Flowers have a pistillate and are staminate as well. Lobes are narrow-triangular, and are either white, pale yellow-green or just green in colour. Stigmas are obovoid trigonous and are long.
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The low and spreading intricately branched shrub typically grows to a height of . It blooms from July to December and produces yellow flowers. The pungent phyllodes are mostly patent with a straight or shallowly recurved shape. They are trigonous-terete approximately in length and wide.
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After the iris has flowered, it produces a cylindrical or oblong, seed capsule, between May and August. It is obtusely trigonous (triangular in cross- section). It is long and 1.3–1.5 cm wide, with a sharp pointed end. Inside the capsule, are semi-orbicular, brown seeds.
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The annual sedge typically grows to a height of and has a tufted habit. It blooms between May and December and produces green-yellow-brown flowers. The erect and glabrous grass has fine and numerous roots. It as slender or rigidulous, trigonous stems that are thick.
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The rhizomatous perennial grass-like sedge typically grows to a height of and has a tufted habit. It blooms between July and March producing brown flowers. It normally has a short thick rhizome with smooth, trigonous and terete culms. The leaves are reduced to sheaths, except for juvenile plants.
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The flattened spikelets occur in clusters of 5 to 15 each containing 6 to 25 flowers. Each spikelet is in length and wide. After flowering trigonous pale brown nuts form with a narrow-obovoid to narrow-ellipsoid shape. The species was initially confused with Cyperus gilesii and Cyperus enervis.
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The rhizomatous glaucous perennial sedge typically grows to a height of and has a tufted habit. The plant blooms between January and August producing brown flowers. The culms are obtusely trigonous and densely papillose. The leaves are long and flat on top while folded at the base and around in width.
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The annual herb or grass-like sedge typically grows to a height of and has a tufted habit. It blooms between in spring between April and May producing green flowers. The root system consists of thin dense fibrous roots. The stems are trigonous to triquetrous up to a length of .
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It is a tufted perennial sedge, with erect, biconvex culms, growing to 1–2 m in height. The smooth leaves are mostly basal, 1–1.8 m long and 2–3 cm wide. The inflorescence is much branched and 10–20 cm in length. The fruits are narrowly ellipsoidal-trigonous brown nuts, 2 mm long.
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L. nivalis has subequal and acute tepals long and castaneous to blackish brown in colour. The plant has six stamens as well as anthers long, filaments long, three styles long and stigmas long. L. nivalis produces an ovoid-trigonous seed capsule with exceeding tepals; capsule segments are blackish brown and 2.1–2.3 × c. 1.2 mm.
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The leaves have hard, waxy, white margins and keels. The upper surface of the leaves are slightly concave. They are lanceolate and trigonous, with a point that is rounded but with a tiny spike. Juvenile plants have distichous leaves (their flat leaves in two opposite ranks) but adult plants form an erect rosette, with thick, sharp, keeled leaves.
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The leaves are just sheaths. The simple or compound inflorescence has four to twelve primary branches up to a length of approximately but usually shorter. The spikelets are flattened with between four and fifteen in each cluster each are long and in width. Following flowering a grey-brown trigonous nut with an obovoid to ellipsoid shape will form.
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The ascending or spreading leaf blades are with a trigonous and tapering apex. The inflorescences consist of clusters of three to six spikelets progressively spaced further away from each other. The spikelets are narrow and elongated, and the leafy bracts are slender and exceed the clusters. The reddish brown, lanceoloid spikelets are long with acuminate apices.
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Leaves are usually longer than the culms and are strongly septate to nodulose and around wide. The compound to decompound inflorescence has three to eight primary branches up to in length in dense clusters. Following flowering it will form a trigonous pale red-brown to dark brown nut. The nut is narrow- ellipsoid in shape with a length of and a diameter of .
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The perennial rhizomatous sedge typically grows to a height of and has a tufted habit. The trigonous or terete culms are smooth with a height of and a diameter of . It has septate to nodulose leaves of about the same length as the culms with a width of about . It blooms between May and July producing green-yellow-brown flowers.
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Cyperus scariosus is a perennial slender herb, stem at base nodosely thickened and suddenly constricted into a wiry rhizome, sub solitary, triquetrous at top. Leaves long, often overlapping stem. Flowers borne in compound umbel, spikes loosely spicate of 3-8 spixelets. Seeds in the form of trigonous nuts, flowers and fruits almost throughout the year, but chiefly during rainy season.
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Tetraria are perennial herbs, with generally few nodes. The leaves are conspicuously sheathed with flat or incurved blades. The inflorescence is usually a narrow panicle, with the flowers being bisexual, the lower flowers being male, and there are generally three stamens and three stigmas. The fruit (a nutlet) is generally trigonous and often retains its style as a beak or crown.
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Nepenthes hamata is a strong climber. The stem, which may be branched, reaches a maximum length of around 7 m. It is terete to obtusely trigonous and varies in diameter from up to 3 mm in rosettes and short stems, to 4–5 mm in climbing stems. In the former, the internodal length is typically up to 6 mm and in the latter 3.5–6 cm.
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The annual or perennial sedge has a slender tufted habit. It has smooth trigonous or triquetrous shaped culms that are typically in height with a diameter of diameter. The septate to nodulose leaves are shorter than the culms and have a width of about . The sedge flowers in spring and summer producing simple inflorescences with one to five branches that have a length of around .
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Cyperus victoriensis, also known as channel nut grass is a sedge of the family Cyperaceae that is native to Australia. The rhizomatous perennial herb to grass-like sedge typically grows to a height of . It has slender rhizomes that form ovoid to ellipsoid shaped woody tubers that are in diameter. The mostly terete culms are smooth and trigonous with a length of and a diameter of .
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It forms compound to decompound inflorescences that have with seven to thirteen branches that are up to in length. The spikes have a cylindrical form and are around long with a diameter of around . Following flowering it will form a dark yellow-brown trigonous nut with a narrow-obovoid to narrow-ellipsoid shape. The nut has a length of and a diameter of about .
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Terminal male spike Carex hirta grows tall, with leaves long and (occasionally up to ) wide. The stems are trigonous (roughly triangular in cross-section), but with convex, rounded faces. The leaves, leaf sheaths and ligules are all hairy, although plants growing in wetter positions may be less hairy; these have sometimes been separated as C. hirta var. sublaevis by Jens Wilken Hornemann, but this may not be a worthwhile taxon.
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The leaves have a width of and are ridged with deep sharp depression down the middle. Between two and seven inflorescences can be found on each stem. The inflorescence are composed of up to 20 or smaller red-brown spikelets which are in length. After flowering it will form a trigonous dark brown-black nut with a narrow-obovoid shape that is approximately with a diameter of around .
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The plant has short leaves that have a width of with a well developed ligule. The stems at the base of the plant have papery sheaths that are scabrid towards the top. When it flowers it produces a simple, loose inflorescence with a peduncle that has a spike of spikelets with one to three rays. Later it will form a brown to black trigonous nut that is in length.
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Red-purple, loose, open leaf sheaths cover the base of the plant with the leaves being much sorter than the stems. The leaves are greyish-green in colour with a narrowly linear shape and a width of . The inflorescence is composed of umbellate spikes, with three to four rays hat are up to in length. Following flowering it will form a dark brown to black trigonous nut that has a broad-obovoid shape.
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The dense flower clusters are subdigitate with a hemispherical to globose shape and a diameter of around . There are one to three leaf-like involucral bracts. There are many flattened spikelets per cluster that have a length of and a width of containing 8 to 34 golden brown to red-brown flowers. After flowering a trigonous very narrow-ellipsoidally shaped red-brown to grey-brown nut forms that has a length of and a diameter.
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The rigid, pungent and glabrous phyllodes are patent to slightly reflexed and straight to slightly recurved with a tetragonous or sometimes trigonous cross-section. The phyllodes are in length and around wide with four main 4-nerves. It blooms from July to September and produces yellow flowers. The simple inflorescences are found singly or in pairs in the axils and have spherical slightly obloid shaped flower-heads containing 16 to 20 cream to pale yellow coloured flower.
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Later a trigonous, narrowly obovoid gery-brown to black nut will form with a length of and a diameter of . It is endemic to much of mainland Australia and is found in all states. In Western Australia and is found along streams and creeks in the Kimberley region where it grows in sandy-clay soils. In New South Wales it is widespread through most non-coastal areas and is known on floodplains and the banks of inland watercourses mostly on clayey soils.
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Like other irises, it has 2 pairs of petals, 3 large sepals (outer petals), known as the 'falls' and 3 inner, smaller petals (or tepals), known as the 'standards'. The falls have a beard in the centre, which is either blue of yellow. After the iris has flowered, it produces an elliptical or trigonous (having three angles or corners) seed capsule, that is 2–3 cm long, when ripe it is straw coloured. Inside the capsule are many little, elliptical shaped, dark brownish seeds.
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The corolla is ochroleucous (whitish), tinged or veined with dull lilac or purple; banner 4¾–6 mm, moderately recurved (45–85°); wings nearly as long; very obtuse keel, 3½–4 mm. The pods are small, sessile, puberulent to strigose, spreading to declined, often humistrate, in profile ovoid-oblong, straight or a trifle incurved, obtuse at base, abruptly acute at apex to short-mucronate, thickened, incompletely to fully bilocular (2-celled), cordate in cross-section, trigonous or compressed-triquetrous, the lateral faces flat, the dorsal (upper or adaxial) face narrower and sulcate (grooved), carinate by the ventral suture, the dorsal suture shallowly to deeply sulcate; thin, papery, green to stramineous (brownish) valves strigulose, 4–7 mm long, 1½ -2½ mm in diameter, deciduous from receptacle, dehiscence primarily basal and occurs after falling. The ovary is strigulose and contains a few seeds (ovules 4–8).
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