432 TRELEASE— THE DESERT GROUP NOLIXE^. [April 21, 



Specimens examined: Zacatecas. Cedros (Lloyd, 118, — the 

 type, and 82, 1908; Kirkzcood, q6, 1908). Coahuila. Rancho 

 La Luz (?Eiidlicli, 7, 1905). SaltjUo (?Grcgg, /8, 1846). Ango- 

 stura {'':lVislizcniis, ^oj, 1847). 



D. LUCiDUM Rose, Contr. U. S. Nat. Herb. 10: 90. 1906. 



Dasylirion sp. Schenck & Karsten, Vegetationsbilder. i. pi 46. 



Shortly caulescent. Trunk 1-2 m. high or sometimes prostrately 

 elongated. Leaves 10-17 mm. wide, scarcely i m. 

 long, strongly brush-tipped, typically yellowish, A f^^ 



1^' 



^ 



smooth and glossy: prickles mostly 10-15 "''i"'''- apart, i^l^^JSv/^ 



2-3 mm. long, from yellow passing through red to ^^^ ^ ^ 



almost chestnut, the margin often reddish. Inflorescence 2-3 m. 

 high. Fruit narrowly elliptical-obovate, 4-5 X 7-^ mm., the rather 

 slender style about half as long as the rather narrow deep notch. 

 Seed 2.5-3.5 i''"'!''''- — P^- -. 10, 12. 



South-central ]\Iexico. \\'ith Bcaucaniea gracilis and stricta. 



Specimens examined: Puebla. Tehuacan (Rose, Painter & 

 Rose, lOOOQ, 1905, — the type; Trclcasc, 1903, 1905; Purpns, 394/, 

 1909). Esperanza ( V- Purpns, 1907 ). San Luis Tultitlanapa ( JPiir- 

 piis, 50S2, 1908). 



D. Palmeri Trelease. 



Habit? Leaves 25 mm. or more wide, scarcely i m. long, some- 

 what brush-tipped, green or lightly glaucous, smooth, 

 ^Vf^^ (T) '^^"^^' prickles mostly 15-25 mm. apart, 3-5 mm. long, 

 _^/^ _y^ yellow, becoming brown upwards, the intervening 

 ■"" '' ' ^ margin rather smooth. Inflorescence moderately high. 

 Fruit narrowly elliptical- or triangular-obovate, 3-4 X 6 mm., the 

 stout style about equaling the rather open shallow notch. Seed 2X3 

 mm. — PL 12. 



Northeastern ISIexico. 



Specimens examined: Coahuila. San Lorenzo Canon' {Palmer, 

 6p6, 1905, — the type). 



D. Parryanum Trelease. 



Habit? Leaves becoming 10-15 mm. wide, scarcely 50 cm. long. 



