191 1.] TRELEASE— THE DESERT GROUP XOLIXEyE. 443 



Plate 12. Fruit characters. A, Xolina: Graminifolije (four fruits of 

 N. Lindheimeriana) , — Microcarpae (branchlet of .V. microcarpa) , — Erumpentes 

 (branchlet of A', texana), — and Arborescentes (four fruits of N. Parryi). — 

 All natural size. B, Dasylirion: i, D. ccdrosanum (type), — 2, D. lucidum 

 (Trelease, 26),— 3, 4rU. ieiophyllum (3, Van Horn, Eggert, 4, type),— 5, 

 D. Palmcri (type), — 6, D. texanmn (Lindheimer, 1213), — 7, D. simplex (type), 

 — 8, D. Wheeleri IVisUzcni (type), — 9, 10, D. Wheelcri (9, Girard, 10, 

 Wooton, 72), — II, D. durangense (type), — 12, D. graminifolium (Pringle, 

 3746), 13, D. glaucophyllum (Berger), 14, D. acrotriche (Haage & Schmidt), 

 — IS, D. Berlaiidieri (type), — 16, D. loiigissimum (type), — All natural size; 

 four numbers in a row, from left to right. 



Plate 13. Germination of Nolina longifoUa. — A, normal seedlings, one 

 with slightly shouldered haustorium. B, various straightening of the cotyle- 

 don from normal arch to erect form. — All X 3. 



Plate 14. Germination. A, Bcaucarnca stricta. — the haustorium in 

 place, though broken off (Rose). B, Calibanus Hookerii (Rose). The haus- 

 torium deeply dorsal on the cotyledonary sheath. — Both X 3. 



Plate 15. A, Dasylirion ccdrosaiiuiii, seedling with deeply dorsal haus- 

 torium, X 2; B, D. texanum, mature leaf tips showing dorsal exfoliation of 

 fibers, natural size. 



Plate 16. Nolina Hartzvcgiana. (Hartweg, 406, in Herb. Delessert). 

 C. de Candolle. — Reduced. 



Plate 17. Nolina rigida. Anatis rigida. (Plate XVHI of the Sese 

 and Mogino drawings in Herb. DC., by Node-veran.) C. de Candolle. 

 — Natural size. 



