antrorse


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antrorse

(ăn′trôrs′)
adj. Biology
Directed forward and upward, as the hairs on certain plant stems.

an′trorse′ly adv.
References in periodicals archive ?
Leaf blades ligulate, acute to acuminate, apiculate, 3-6 cm wide, serrate with dark straight to antrorse 2-4 mm long spines, the leaf margins variably punctate-lepidote, grey-green to reddish.
Leaves erect, curved at apex, acute to somewhat apiculated, lustrous green above, somewhat dull below, 6070 cm long, 6,4-7 cm wide, leaf sheath 11,5-12 cm long, glabrous, margins with dark antrorse, straight or retrorse thorns to 5 mm long, leaf apex with a reflexed mucro.
1.5 cm long, abaxially completely covered by a coarse layer of white trichomes, adaxially sparsely and inconspicuously white lepidote except for the densely white lepidote apex, coarsely spinulose, spines sub-triangular, uncinate, blackish, 3-5 mm long, 8-20 mm apart, the basal ones prevailing antrorse, the upper ones prevailing retrorse.
15 mm apart from each other, uncinate, retrorse to antrorse, castaneous, glabrous.
Leaves numerous, fleshy; sheaths white to yellowish, broadly oblong to square 6-12.5 x 5-10 cm, lustrous basally on both surfaces, apically white-lepidote on both surfaces; blades extended to reflexed and pendent in mature plants, dark green, narrowly triangular, attenuate, 19-80 x 1.7-6.5 cm, densely white-lepidote on both surfaces, glabrescent on the adaxial surface, pungent at the apex, the margin armed with yellowish curved antrorse and uncinate spines, 1.6-2 mm long, 6-12 mm apart, with a tuft of white scales in the axile.
20 in number, rosulate, suberect-arcuate, coriaceous, forming a broadly crateriform rosette at base; sheaths narrowly elliptic, 28-29 x 10.5-12 mm, pale castaneous adaxially, pale green abaxially, densely and minutely lepidote on both sides; blades linear, some inconspicuously narrowed toward the base, 75-80 x 7-8 cm, green with sparse darker green spots, sparsely and inconspicuously white-lepidote adaxially, densely white-lepidote abaxially with trichomes not at all obscuring leaf color and sometimes forming sparse crossbands, apex acute and apiculate, margins densely (at apex) sparsely (toward the base) spinose; spines triangular, uncinate, antrorse, castaneous toward the apex, the basal ones 1.5-2.5 mm long, 15-25 mm apart, the upper ones ca.