The gynostemium is firm, with a clear foot. The anther is bent. The two or four pollinia are naked, they contain no viscidium, just like the Malaxideae.
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The sepals are united (gamosepalous). There are six to 40 stamens in one whorl. They are united with the style, forming a gynostemium. The ovary is inferior and is four to six locular.
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Both genera share an identical flower structure and a number of vegetative features. Within both Bartholina and Holothrix auricles (filament appendages) are absent. This differentiates them from all other Orchideae and Diseae. Instead their staminodes and gynostemium are homologous.
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This new entity with its dormant seeds is the fruit, whose functions are protecting the seed and dispersing it. In some cases, androecium and gynaecium may be fused. The resulting structure is a gynandrium (gynostegium, gynostemium, or column), which is supported by an androgynosphore.
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At the base, the labellum overhangs the reproductive organs umbrella-like, the 1 mm long gynostemium (fused stamens and pistil). The 1.5 mm filaments are dark purple, the anthers dark purple to pink, 0.5 by 1 mm. The style is about 1.5 mm in length and the capsule 2.5–3.5 cm.
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Stylidium subg. Centridium is a subgenus of Stylidium that is characterized by a globose hypanthium, a stipitate brush-like stigma, and gynostemium mobility not produced by a sensitive hinged torosus but by the movement of a cunabulum. All species with the possible and doubtful exception of S. weeliwolli are annuals.Lowrie, A. and Kenneally, K.F. (1998).
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His books included Demonstrations botaniques (1808), De Orchideis europaeis (1817), Commentatio botanica de Conifereis et Cycadeis (1826) and De Musaceis commentatio botanica (1831). He gave us the special description terminology for the orchids, such as pollinium and gynostemium. The genus Richardia Kunth, (Araceae) was named in his honor. It is now a synonym of the genus Zantedeschia .
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The gynostemium i s2.7 mm long by 1.6 mm wide. There 6 yellow antheres, each consisting of 4 pollen sacs, and 6 green stigmatic lobes. The fruits are pendulous, cucumber-like, indehiscent, woody, 6-ribbed, up to 5.5 cm long, and brown when mature. The seeds are heart-shaped, convex and rough above, concave and smooth below, and 4 mm long by 4 mm wide.
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Telipogon diabolicus is a species of orchid in the genus Telipogon. Only a single population of 30 plants are known to exist, on the border between the Putumayo and Nariño departments of southern Colombia. Accordingly, it is classed as "critically endangered" in the International Union for Conservation of Nature's Red List. The name diabolicus refers to the way its wine-red or maroon gynostemium looks like the head of the devil.
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Stylidium diceratum is a dicotyledonous plant that belongs to the genus Stylidium (family Stylidiaceae). The specific epithet diceratum is Greek for "two horns", referring to the two appendages that are present on the bend of the gynostemium. It is an annual plant that grows from 15 to 35 cm tall. The longer leaves are lanceolate and the shorter ones are spathulate, forming a basal rosettes around the stem.
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Flower structure is more uniformly distributed within the monocots. Monocot flowers occur with parts having multiples of three; usually there are three stamen, three petals and three sepals (six tepals), and usually just one stigma. However stamens in twos can be found in Cypripedioideae while single fertile stamens can be found in Philydraceae, Zingiberaceae, and as gynostemium in Orchidacaea. Furthermore, flower structures that evolved to trap insects to accomplish pollination are found in many monocot genera.
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Inflorescences are umbellate racemes and produce flowers that are white, pale pink, or dark pink and bloom from November to December in their native range. S. preissii is only known from south-western Western Australia from Bremer Bay to Israelite Bay with a few populations near Jandakot. Its habitat is recorded as being white sandy soils in open heathland. S. preissii is distinct within its subgenus because it possesses a strap-like gynostemium column with a dilated cunabulum.
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Stylidium aceratum is a dicotyledonous plant that belongs to the genus Stylidium (family Stylidiaceae). It occurs within the south west region of Western Australia The specific epithet aceratum is Greek for "lacking horn", referring to absence of an appendage that is present in other species on the bend of the gynostemium. It is an annual plant that grows from 5 to 9 cm tall. The spathulate leaves form a basal rosettes around the translucent white stem.
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All of the other orchids, the clade called Monandria, retain only the central stamen, the others being reduced to staminodes (4). The filaments of the stamens are always adnate (fused) to the style to form cylindrical structure called the gynostemium or column (2). In the primitive Apostasioideae, this fusion is only partial; in the Vanilloideae, it is more deep; in Orchidoideae and Epidendroideae, it is total. The stigma (9) is very asymmetrical, as all of its lobes are bent towards the centre of the flower and lie on the bottom of the column.
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