trigonous


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trigonous

[′trig·ə·nəs]
(biology)
Having three corners.
Having a triangular cross section.
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References in periodicals archive ?
Stems 20-90 (-125) cm tall, 1-3 mm wide, trigonous to subterete, often somewhat compressed, glabrous or lightly pubescent.
5-44 cm tall, about equaling or longer than leaves, obscurely trigonous, smooth, with glabrous, pale to dark reddish brown basal sheaths.
Notes: Mai and Walther (1988) compared the single trigonous achene recovered to the Iberian C.
Column erect, slightly arcuate, trigonous, apiculate, 8(9) mm long, 4-5 mm wide at apex, base and middle whitened to pinkish, towards apex purple, stigmatic surface green; column foot (2)3(4) mm long, yellowish.
3-1 mm wide, erect, obtusely trigonous to compressed-trigonous (about 0.
5-18 cm tall, erect or slightly curved, more or less trigonous (at least distally), smooth but sometimes scaberulent beneath the inflorescence, with glabrous, brown basal sheaths.
Styles trifid or some bifid in the same spikelet; achenes plano-convex, slightly trigonous or biconvex, minutely reticulate 2 2.
7 mm long, sublinear, base acute and apex acute and apiculate, dorsifixed at the middle, the antesepalous ones slightly exceeding the antepetalous ones; pollen biporate, broadly oblong-elliptic, pores large, exine reticulate, lumina polygonal, muri narrowed; stigma conduplicate-spiral, ellipsoid, white, lobes with densely crenulate-papillose margins; ovary clavate, trigonous, white, glabrous, ca.
5 mm long, whitish, margins long fimbriate-papilose, papillae conspicuous; ovary subclavate, subterete to nearly trigonous, free and not fused to other ovaries, whitish, ca.
5 mm in diameter, white, the blades obtuse, suberect, the margins crenulate; ovary 6-8 mm long, 5-6 mm in diameter at the apex, trigonous, glabrous, green; epigynous tube inconspicuous; placentation apical; ovules obtuse, numerous.
5 mm in diameter at the apex, trigonous, densely white-sublanate, white; epigynous tube inconspicuous; placentation apical; ovules obtuse, numerous.
5 mm, not contorted nor spiral, margins shortly crenulate to subentire; Ovary 4-5 x 4 mm, trigonous, whitish, sparsely lepidote; epigynous tube lacking; placentation apical; ovules numerous, obtuse; Fruits unknown.