Sporobolus airoides


Habit

erect, large bunches

Roots

short rhizomes

Vernation

curled

Leaf-blade

rolled, drooping, narrow, pointed; glabrous, veins each side of midrib 3-4; ribs indistinct; margin glabrous; midrib not prominent; width 1 mm, length 10-25 cm

Auricle

none

Ligule

hairy, 1/4-1/2 mm, hairs on back of ligule 1-3 mm

Sheath

round, glabrous, papery margin

Nodes

glabrous

Internodes

glabrous

Culms

round, not branched

Inflorescence

panicle, 12-30 (40) cm long, with open, widely spreading branches, branchlets, and spikelets

Spikelet

2-2.8(3) mm long, brownish or lead-colored

Glumes

thin and rounded, the first about half the length of the lemma, the second two-thirds or more the length of the lemma

Lemmas

thin, rounded, blunt to narrowly acute

Paleas

about as long as the lemma and usually broader at the apex

Lodicules

Disarticulating

above the glumes

Caryopsis

obovate, somewhat asymmetrical, flattened, usually free from the lemma and palea at maturity but sometimes falling with them