210 PATAGONIAN EXPEDITIONS: BOTANY. 



Spikes 4-7, fasciculate, strict. Flowers 2, the upper setigerous below the 

 apex; floral glume setigerous, ciliolate. 

 (Trop. Amer.) ; N. Patagon. 



2. C. RADIATA Sw. (C. beyrichicina Kth.) 



Culm creeping, branching, compressed ; leaves scabrous, margined. 

 Spikes 6-8, digitate, rachides flattish. Spikelets 2-flowered, the upper 

 flower degenerate, i-awned. The glumes lance-subulate ; floral glumes 

 long-awned. 



(Trop. Amer.) ; N. Patagon. 



35. TRICHLORIS Fourn. 



Tall perennials with flat leaves. Spikes numerous, slender, sessile on 

 the peduncle, subverticillate, forming a dense panicle, which is oblong and 

 echinate by very many dense awns. Spikelets slender, erect, i-, rarely 

 2-flowered, sessile along the continuous rachis of the unilateral spikes, 2- 

 seriately crowded ; rachilla articulated above the lower glumes, produced 

 beyond the flower and glumiferous. Empty glumes 2, small, the second 

 awned ; the floriglume 3-awned, its awns long, straight. Superior empty 

 glumes various, some 3-awned, others reduced. 



Species 4-5, Mexico to S. Amer. 



a. Flower of spikelet i, hermaphrodite, and 2 or I sterile flowers. Awns of fertile floral glume 



3, subequal. 



b. Neuter flowers 2. mcndocina (type). 



b2. Neuter flower i . mendocina blancliardiana. 



a2. 2 flowers of spike hermaphrodite, and 3 sterile ; mid awn larger. flwiflora, of Texas, Mex., 



Argentina. 



T. MENDOCINA BLANCHARDiANA (Gay) Kurtz. (Scribner's description 



of T, blanckardiana.} 



Culm stout, leafy, 60 cm. tall. Sheaths compressed, keeled, hairy on 

 edges, especially near the throat; upper surface of the conduplicate leaf 

 hairy near the base. Spikes slender, 12 or more, 7-10 cm. long, in a 

 terminal panicle. Spikes i -flowered, flower 3-awned, hermaphrodite; also 

 a stiped 3-awned rudiment, occasionally 2 rudiments. 



N. Patagon. Common by RR. Colorado and Negro. 



