438 TRELEASE— THE DESERT GROUP XOLIXE.E. [April 21, 



D. durangense Trelease. 



Habit? Leaves 20 mm. wide, scarcely i m. long, lightly glau- 

 cous, nearly smooth, dull: prickles 5-10 mm. apart, 

 2-3 mm. long, yellow, with orange tips. Inflorescence 

 tall. Fruit broadly elliptical-cordate, 7-8 X 9 mm., 

 the thick style scarcely half as long as the rather open 

 deep notch. Seed 2X3 mm. — PI. it, 12. 



North-central Mexico. In the region of KoUna durangoisis. 



Specimens examined : Durango. Durango (Fa/;/R"r, 557, 1896, — 

 the type). 



D. SERRATiFOLiUM Zuccariui, Allgem. Gartcnzcit. 6: 258,303, — name 

 only. 1838; Abhandl. Akad. ^Iiinchen. CI. II. 3 (=Denkschr. 

 16 ) : 225, 228. pi. I. f. Hi. 1840. — Roezl, Belg. Hort. 33 : 



139- 

 Yucca scrratifolia Schultes, Syst. 7. 1716. 1830. 

 Roulinia scrratifolia Brongniart, Ann. Sc. Nat., Dot. ii. 14: 319. 



1840. 

 Dasyliriiiii! scrratifolium Kunth, Enum. PI. 5: 41. 1850. 

 Dasylirion laxiflorum Baker, Journ. Bot. 10: 299. 1872. 

 ?Z). robiistuin Hort. 



Subacaulescent. Leaves 15-20 or even 35 mm. wide, scarcely 



I m. long, whitish, finely roughened on one or both 



faces, dull : prickles 5-10 or even 20 mm. apart, 2-^ 



j/I T?7 — 7^ WiXn. long. Inflorescence ample. Fruit quadrately 



v^7v_L./ — round-obovate, the style equaling the narrow rather 



deep notch. Seed 3X4 nim. 



Southeastern Mexico. Collected by Andrieux near Oaxaca, and 

 by Karwinsky at San Jose del Oro. — Region of NoHiia longifolia. 



Specimens examined : Oaxaca. Las Sedas {Pringlc, ddgy, 1897) . 

 Nochistlan {Consatti & Goucalcs, 1899). 



D. Wheelert Watson in Rothrock, Rept. Wheeler. 6: 378. 1878; 

 Proc. Amer. Acad. 14: 249. 1879. — Wooton, Bull. N. Mex. 

 Exper. Sta. 18: 92. pi. — Lloyd, Plant World. 10: 254. /. f;i. — 

 MacDougal, Publ. Carnegie Inst. 99: 74, pi. ^8. — De Wilde- 

 man. Icones Sel. Hort. Thenensis. 6: 91. pi. 22^. — Sketchy 

 habit figures, without name, are given by Schott in Emory, 

 Rept. Bound. Surv. i. pi. ^J, 42. 



