Eastern Mojave Vegetation Inflorescence of Coll. No. 1998, Achnatherum lettermanii  
 

 

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  Poaceae Achnatherum lettermanii
Scanned 24 January 2019.

Coll. No. 1998, 24 July 2018, characters observed: Perennial, to 70 cm., clumped; Leaves, sheath, 80 mm., open, glabrous, ligule, membranous, 1 mm., auricles, absent, blade, 150 mm. × 1.7 mm. wide, revolute, sparsely scabrous; Inflorescence, 1 per culm, >leaves, panicle, 100 mm. × 12 mm. wide, spikelets, many; Axis, not extended, glabrous; Spikelets, many, 6 mm. × 1 mm. wide, excluding awn, similar, borne singly, pedicels, 1.2-6.0 mm., 1-flowered; Compression, unremarkable; Disarticulation, above the glumes; Glumes, subequal, lower, 7 mm. × 1 mm. wide, veins, #1, upper, 6.5 mm. × 1.3 mm. wide, = lowest floret, veins, #3, rounded, membranous, tip, extended sharp soft point, not really an awn; Florets, 1 per spikelet, bisexual; Callus, 0.5 mm., pointed, but not sharp like other cogeners, short, straight, white hairs; Lemma, 4 mm., ≤glumes, ovate, color, tan, stiff but not hard, hairs, slightly longer and more dense distally than proximally, straight, longest 1.2 mm., color white, veins, #3, parallel, then converging at awn, tip, 2-forked, awns, #1, 17 mm., attached at end of lemma, scabrous, bent twice, twisted, terminal segment straight; Palea, 3.5 mm., <lemma, 87% length of lemma, membranous, hairy, hairs extending beyond tip, tip, entire, color, tan; Anthers, 1.4 mm.; Achene, 3 mm., green.

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Date and time this page was prepared: 10/12/2019 9:36:42 AM