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n.1.(Bot.) Some unusual appendage about the pistil, as the bottle-shaped body in the sedges, and the bristles or scales in some other genera of the Sedge family, or Cyperaceæ.
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There have existed a long-standing disagreement in the use of the terms achene and nutlet to refer Carex's fruits, and perigynium and utricle to refer the enclosing prophyll (Global Carex Group, 2015).
4 mm wide, compressed-trigonous with more or less flat, oblongobovate sides, tightly enveloped by the perigynium, brown with pale yellowish angles, sessile (or nearly so).
1 mm wide, compressed-trigonous with oblong-obovate sides, tightly enveloped by perigynium, dark brown to blackish (when mature), sessile or nearly so.
5 mm wide, trigonous, greenish, opaque, slightly pubescent, 11-15-veined, base stipitate-like (when dried); perigynium beak less than 0.
The female lays eggs either on the surface of or in a hole bitten in the perigynium.
Clarification of the use of the terms perigynium and utricle in Carex L.
Also, the perigynia of bog plants are, in general, longer and narrower than those of grassland plants; additionally, the perigynia of the former are smooth except sometimes sparingly hispidulous just beneath the beak, whereas those of the latter are distinctly appressed hispid above the middle of the perigynium.
6 mm wide, narrowly elliptical to elliptic, smooth but sometimes distally sparingly hispidulous abaxially and adaxially, the margins scaberulent to ciliate-scabrous distally, whitish green or stramineous to brownish, 2 prominent veins and the others obscure or weak in the proximal half on both faces, gradually tapered to a puckered base (when dry); perigynium beak 0.
A female flower consists only of a gynoecium, which is subtended by a modified prophyll termed the utriculus or perigynium (Timonen, 1998) enveloping the pistillate flower, and often a rudimentary spikelet rachilla (Fig.
relative length of perigynium beak, and length of perigynium beak teeth, characters #7 and 8, respectively, in the analysis of sect.
7 times as long as wide--#6), perigynium beak relatively long (beak at least 32% the length of the perigynium--#7), culm with chlorenchyma present between bundle cap and epidermis for at least two of three vascular bundles at the angles of the culm (#18), and distal portion of perigynium body only one cell thick (#21).
2006) and easily separated from all other Cyperaceae by naked unisexual flowers where the female is surrounded by a sac-like prophyll known as a utricle or perigynium (Fig.