191 1.] TRELEASE— THE DESERT GROUP XOLIXE.E. 435 



and the pistillate simple or its divisions with a short basal branch. 

 Fruit broadly obovate, 5-6 X / mm., the thick style about equaling 

 the open moderate notch. Seed (immature) 2X3 mm. — PI. 12. 



North-central ^Mexico. In the region of Nolina durangensis. 



Specimens examined : Dur.\ngo. Tepehuanes {Palmer, ^10, 

 1906, — the type). Santiago Papasquiaro (Palmer, ^22, 1896). 



Fruit moderately large ^(usually 6-8 mm. wide), the style not surpassing 

 the wings. Prickles prevailingly upcurved. -V- ' ■ 



vLea^l not brush-tipped, glaucous. 



D. GLAUCOPHYLLUM Hooker, Bot. Alag. iii. 14. pi. ^041. 1858. — [As 

 Dasylirium]. — Baker, Journ. Bot. 10: 298. 1872. — ?Gard. 

 Chron. iii. 40 : 247. /. lOi. 

 D. glaucum Carriere, Revue Hort. 44: 435. /. 1872. — Copied in 

 Garden. 3: 23. /., and Florist and Pomol. 1874: 17. /. — Card. 

 Chron. n. s. 13: 82, 205. /. j/. — ??Roezl, Belg. Hort. 33: 139. 

 ?Z). serrafifoliiim Rept. 'Mo. Bot. Card. 14: 12. /. 

 Bonaparica glanca Hort. 



Shortly caulescent. Trunk scarcely 5 m. high. Leaves as much 

 as 12 mm. wide, over i m. long, glaucous, nearly or 

 quite smooth, dull: prickles 5-10 mm. apart, 2 mm. 

 long, yellowish white or the tips becoming slightly 

 brownish. Inflorescence 4-6 m. high. Fruit sub- 

 elliptical, 6 X 9-10 mm., the thick style about half as 

 long as the closed deep notch. Seed 2.5 X 4 nim. — PL 12. 



East-central Mexico. In the region of D. acrotriehe and Cali- 

 ba Jilts. — The type locality is Real del Monte. 



Known to me only in cultivation. The fruit description is based 

 on material cultivated at La Alortola {Berger, j6o, 191 1). 



Leaves more or less brush-tipped. 



Leaves narrow (scarcely 10 mm.), strongly brush-tipped. 



D. ACROTRiCHE Zuccarini, Abhandl. Akad. Munchen. CI. II. 3 

 (^Denkschr. 16) : 226, 228. pi i. f. iv. 1840. 

 Yucca acrotricha Schiede, Linnsea. 4: 230. 1829; 6: 52. — 



Schultes, Syst. 7: 1716. 1830. 

 RouUnia gracilis Brongniart, Ann. Sc. Xat., Bot. ii. 14: 320. 

 1840. 



