191 1.] TRELEASE— THE DESERT GROUP XOLIXE^. 417 



Leaves very narrow, 2-5 mm. wide, smooth-edged or slightly 

 roughened, from half-round becoming triquetrous. 

 Inflorescence often much shorter than the leaves, with 

 oblong divisions often 15 cm. long and lower branch- 

 lets half as long, or subsimple. Fruit somewhat 

 depressed, 4 X 5-6 mm. Seed 3 mm. in diameter. — PL 12, 75. 



Central Texas. In the region of N . Liiidlicimcriaiia and Dasy- 

 lirion texanum. 



Specimens examined: Texas. \'icinity of New Braunfels (Liiid- 

 hcimer,550, 1846, 712, 1847, — the types ; 1218, 1849). Austin {Hall, 

 ^35' 1872). Hamilton County {Rcz'erchon, gdy, 1882). Cibolo 

 {Havard, 1883). Blanco County {Rcvoxlion, mixed with 1606). 

 Kerr County (Bray, 184, 1899). Davis Mountains (Earlc & Tracy, 

 J22, 1902). Gillespie County {Jenny, 327). Comstock {Thomp- 

 son, 191 1 ). Without locality {Buckley). 



"v Lower bracts mostly triangular, becoming friable. 



Xfi^??t pa^nicle division much shorter than the long-caudate 

 subtending bract, with rather weak finally ascending 

 branchlets. 



N. affinis Trelease. 



Leaves very narrow, 3-4 mm. wide, sometimes smooth-edged. 

 Inflorescence at length with broad divisions 10 cm. long ^ 

 and lower branchlets scarcely half as long. Fruit de- P" '^^i 

 pressed, 5 X 6-7 mm. Seed 3 mm. in diameter. •-— ^ 



North-central Mexico. On the outskirts of the range of A^ ^n<>n- 

 pens, N. microcarpa and Dasylirion Iciophylluni. 



Specimens examined: Chihuahua. Rocky hills near Chihuahua 

 {Pringle, i, 2, 1885, — the type). Santa Eulalia {Palmer, ijg, 1908; 

 Rose, 1 16/ 2, 1908). 



N. caudata Trelease. 



?Noliiia sp. Rose, Contr. U. S. Nat. Herb. 20. pi. 46-8. 



Leaves very narrow, 4 mm. wide, somewhat rough- 

 edged. Inflorescence slender, with narrow divisions 

 scarcely 10 cm. long and lower branchlets 2-5 cm. 

 long. Fruit rather depressed, 4 X 5-6 mm. Seed 3 



mm. in diameter. — PL 6. 



PROC. AMER. PHIL. SOC. , L. 200 AA, PRINTED AUG. 7, I9II. 



