ClILUUIDEiB. 437 



Arizona, Priiigle iu 1884. 



11. L. dubia (II. H. K.) Nees, Syll. Ratisb. 1:4 (1824); Agrost. 

 Bras. 2:433 (1829). C/tloris dubia II. H. K. Nov. Gen. et Sp. 1 : 

 16!) (1815). D. dubia Scribii. Bull. Torr. Club, 10:30 (1883). 



Culms rather slender, 20-30 em. high. Sheaths smooth or sca- 

 brous; ligule very short, bearing long hairs; blades scabrous, Hat or 

 involute, 20-40 cm. long, 3 nmi. wide. Panicle barely exserted, 

 15-20 cm. long, spikelike, rays 8-15, ascending, 5-12 cm. long. 

 Spikelets on short pedicels, slightly imbricate, 4-G-llowered, 5-T 

 mm. long; empty glumes lanceolate, 1 -nerved, first 3-4 mm. long, 

 second 4-5 mm. long; floral glume ovate-oblong, about 4 mm. long, 

 the three nerves pubescent and disappearing a little below the two 

 obtuse lobes of the apex; pulea linear, 3.5 mm. long, the nerves 

 densely clothed with short pubescence. 



Florida, Curiis.s 3450, (Harber; Texas, Jones, XvaUey ; Arizona, 

 Lemmon 3(J8; Mexico (Chihuahua), Pringh 422, Palmer for U. S. 

 Dept. Agricul. 547, Palmer 270. 



Dr. Palmer says: "In shady places among the rocks of the 

 mountains." ,.- [ 



12. L. Mexicana Scribn. Proc. Acad. Phil. Sc. 308 (1S!)1). 

 Culms simple, terete, vsolid, erect. 1 mm. or more high from a 



strong rootstoek. Sheaths about the length of the internodes, lig- 

 ule a ring of stiff hairs. 2-3 mm. long; l)lades glabrous, flat, lanceo- 

 late, 30-40 cm. long, 1-2 cm. broad, tai)ering gradually to the 

 very acute apex, midrib white and prominent below. Panicle 

 pyr)":nidal, 30-40 cm. long; rays simple solitary or tlie lower sub- 

 verticillato. Spikelets 10-14 mm. long, 3-4-flo\verod, erect, remote 

 below; pedicels mostly shorter than the si)ikelet3; empty glumes 

 membranaceo-chartaceous. broadly lanceolate, first 4-5 mm. long, 

 second 0-7 mm. long, scabrous on the nerve; floral glume 8 mm. 

 long, densely silky-villous for half or more of its length, mid-nerve 

 extending into an awn 1-3 mm. long beyond the entire apex, lateral 

 nerves evanescent above; palea 2-toothed, callous, densely })ilose. 

 Stamens 3. Ovary smooth. 



Mexico, Pr ingle 3252. on limestone ledges. 



13. L. polygama (Fourn.). Gouima pohjgama Fourn. Ilemsl. 



