Sporobolus. | GRAMINACEAE. 517 
Kauai! Waimea (Kn., and M. & B. 273). — Distinguished from A. stolonifera, L., 
which it most resembles, pe by the ae which in length and breadth equals its 
and the more broadly truncate pasty glume, not to mention the elongate last in- 
ternode and the great aber of its 1 
19. SPOROBOLUS, R. Br. 
Spikelets in open or contracted, often spike-like panicles, 1- flowered, 
awnless, the axis not prolonged beyond the floret. Empty glumes 2, 
approximate. Stigmas subsessile, protruding near the base of the floret. 
Grain short, free, separating from the thin pericarp. 
A considerable genus of the tropical and subtropical regions of both W. orlds. 
1. S. Virginicus, Kunth, Rev. Gram. I, 67. — Enum. Pl. I, 210. — Stems 
procumbent, freely branching, terete, stiff, the branches ascending, 
10—15‘ long, foliose to the top with 5—20 subopposite pairs of leaves 
Leaves pale, distichous, divaricate, stiff, convolute, with a filiform point, 
5—2‘ long, sparingly ciliate at the mouth of the sheath, otherwise glabrous 
and smooth, the sheaths exceeding their internodes. Ligule short, trun- 
; : 3 ne 
appressed rays ge giveaty single and branching from the base upward, 
smooth. Spikelets on pedicels of their own length, 1'/2“, slender ovoid, 
somewhat acute, glabrous. Outer glumes thin, rather read ovate, 
r than 
u 
1-nerved, basted in the upper third, the lower nearly 1/3 short 
ov 
closely contiguous. Ovary short, pointed with short contiguous styles. — 
Agrostis MDa, a — Vilfa Vir pin Beauy. — Trin, Icon. tab. 48. 
Along the seashor eohe and Kailua, aba Syste and Lahaina, us ui! 
A native of tropical aan evabpres haat found also . Africa and Austr, 
Bu hleoides, — Spike-like panicle shorter and thicker, only Hi : 
Tr. p 
long, haa compact. Spikelets shorter, 1”; compressed. Nerves of the 
palea not quite contiguous. 
Oahu! Kaneohe. 
20. POLYPOGON, Desf. 
Spikelets in a dense spike-like or slightly spreading panicle, 1-flowered 
without prolongation of the axis, the floret naked at the base. Empty 
umes 2, nearly equal, narrow, keeled, ending in astraight awn. Flowering 
glume shorter, thin- membranous, generally truncate- denticulate and aw 
below the apex. Palea bicarinate. Ovary glabrous. Stigmas subterminal, 
short, almost sessile. Grain oblong or linear, free. 
small genus, widely distributed over the globe 
