Perianth bristles
WebJul 30, 2024 · The perianth in Rhynchospora megalocarpa is unusual. The receptacular joint is stubby, bearing staggered cycles of bristles that vary extremely in length and number—on a par with R. alba, R. baldwinii, and R. macra in numbers of bristles. WebIn amphicarpic flowers perianth bristles are usually absent, when present, 1–2, caducous, and sparsely spinulose; the styles are (2–)3-fid, greatly elongated, stigmas are exserted …
Perianth bristles
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WebThe perianth bristles are also retained, and these are shorter than, or the same length as, the achene and tubercle combined. [2] [3] The lengths of both the tubercle and perianth bristles are key characters for distinguishing R. alba from other Rhynchospora species. WebPerianth. It has three inner perianths, which are small and circular, and are closely appressed to the three carpels of the superior apocarpous ovary, each of which is surmounted by a …
WebIn amphicarpic flowers perianth bristles are usually absent, when present, 1–2, caducous, and sparsely spinulose; the styles are (2–)3-fid, greatly elongated, stigmas are exserted from sheath orifices; achenes are larger than those found in normal spikelets, and their shape and surface sculpturing are different (A. E. Schuyler 1969; J ... Web(Fig. 3), the bristles are also destitute of barbs, but a new factor causes them to be developed as long and flexible hairs, which are responsible for the plants common name "Wool-grass." Many of the higher species of Scirpus have developed barbs on the perianth bristles. In Scirpus americanus Pers. the perianth bristles have very
WebOct 12, 2012 · Perianth bristles 6, 1.9 – 3.1 mm long, 1.1 – 1.5 times as long as achene [including tubercle (the persistent style base)], exceeding tubercle by 0.1 – 1 mm, medium … Webperianth bristles. The dark brown achenes (one-seeded fruits) are tiny (less than 2 mm), short beaked, and strongly flattened with about 12 transverse ridges. The wrinkled surface of the achene is visible at 10× magnification. Mature fruit is present from August to early October. Distribution in Massachusetts 1988-2013
WebWhen present the perianth is usually persistent, rarely caducous, white or brown; bristles are vestigial or to 8 mm, shorter to much longer than the scale; margins are smooth or antrorsely or retrorsely toothed or barbed. The filaments often persist after the anthers have been shed, and they are sometimes mistaken for perianth bristles.
WebJul 30, 2024 · The family is characterized by the occurrence of a number of unusual cytological features including: (1) chromosomes with diffuse centromeres, (2) post-reductional meiosis, and (3) pollen grains formed from tetrads in which 3 of the 4 microspores fail to develop. dawes redman criteria metWeb*Perianth Bristles: 4-8, short to as long as the achene. *Achene: Tipped with a skinny, short beak (style) that is not triangular or thickened. *Scales: Awn bent, 0.5-2 mm long. *Spikelets: Sessile, 6-12 mm long. Solitary, but usually some plants have at least 2 spikelets. Always with 1 long, leaf-like bract subtending the spikelets. dawes record searchWebPerianth bristles straight or curved, shorter than or scarcely longer than achenes; plants cespitose; rhizomes short; inflorescence branches ascending or divergent (commonly … dawes redman algorithmWebPerianth bristles retrorsely barbellate (except in scattered forms of R. capitellata, R. cephalantha, and R. capillacea, in which bristles are either smooth or antrorsely barbellate); base of fruit body narrowed to stipe. > 8: 7 Perianth bristles, when present, antrorsely barbellate (shortest ones may be smooth); base of fruit body not ... dawes red feather ladies bikeWebThe family is characterized by the occurrence of a number of unusual cytological features including: (1) chromosomes with diffuse centromeres, (2) post-reductional meiosis, and (3) pollen grains formed from tetrads in which 3 of the 4 microspores fail to develop. dawes redman criteria nhsWebBy the 1990s – with expansion into Main, New Hampshire, Vermont and Rhode Island – we had become the leading provider of employee benefits in New England. We were … dawes records onlineWebThe meaning of PERIANTH is the floral structure comprised of the calyx and corolla especially when the two whorls are fused. the floral structure comprised of the calyx and … dawes redman criteria not met