272 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
12. HORDEAE. 
Spikelets solitary at each node of the continuous rachis__105. Lolium (p. 396). 
Spikelets in 3’s at each node of the articulate rachis___106. Hordeum (p. 396). 
13. BAMBOSEAE, 
Stems climbing or clambering. 
Spikelets 2 to several-flowered, racemose__._107. Arthrostylidium (p. 397). 
Spikelets 1-flowered, in small panicles__..----____ 108. Chusquea (p. 400). 
Stems erect. 
Spikelets 1-flowered, in a long dense terminal panicle; culm herbaceous. 
109. Planotia (p. 400). 
Spikelets several to many-flowered, sessile in clusters, these somewhat 
remote on a common axis; culms woody _--__-- 110. Bambos (p. 401). 
1. TRIPSACUM L. 
Spikelets unisexual; pistillate spikelets solitary, embedded in the joints of a 
thickened cartilaginous articulate rachis, the indurate first glume covering the 
recess in the rachis, the joints readily separating at maturity ; staminate spike- 
lets in pairs at the joints of the continuous upper segment of the same rachis, 
this falling as a whole after anthesis. Stout perennials. 
1. Tripsacum dactyloides (L.) L. Syst. Nat, ed. 10, 2: 1261. 1759. Gama GRAss. 
Coix dactyloides L. Sp. Pl. 972, 1758. 
Tripsacum monostachyum Willd. Sp. Pl. 4: 202, 1805. 
Culms sparingly branching, about 2 meters tall, in large clumps; blades flat, 
up to 3 em, wide; inflorescence of 1 to 3 erect spikes. 
Shady ravines and moist ground at low altitudes, central and southeastern 
United States, through the West Indies to South America. Originally described 
from America, no definite locality given. 
Haiti, Santo Domingo, and Trinidad. 
2. COIX L. 
Spikelets unisexual; pistillate spikelets 2 or 3 together, 1 fertile and 1 or 2 
rudimentary, inclosed in a bony beadlike involucre (morphologically a subtend- 
ing leaf sheath) ; staminate spikelets approximate in 3’s (the third sometimes 
obsolete) on a slender rachis forming a short raceme, the rachis protruding 
from the orifice of the involucre, these ultimate inflorescences borne on the 
ends of numerous branches. Broad-leaved perennials. 
1. Coix lacryma-jobi L. Sp. Pl. 972. 1753. JOB'S TEARS. 
Freely branching, 1 meter or more tall, the cordate clasping blades 2 to 3 cm. 
bread, the “ beads ” 8 to 10 mm. long. 
Moist ground and waste places, especially near dwellings, throughout tropical 
America, cultivated as an ornamental and for the ivory or grayish beads; often 
escaped. Called also “ Christ’s tears,” “ camandula,” and “lagrimas de Job.” 
Originally described from the East Indies. 
Common in the West Indies and to be found on probably all of the islands, 
3. IMPERATA Cyrillo. 
Spikelets all perfect, awnless, all pedicellate, articulate below the glumes, the 
rachis not disjointing, the slender racemes in a narrow spikelike panicle; glumes 
membranaceous, densely clothed with long silky hairs. 
%anicle rarely over 10 cm. long; spikelets 4 mm. long____.__ 1. I. brasiliensis. 
Panicle and blades elongate; spikelets 3 mm, long__-_-.-._.--_2. I, contracta, 
