442 TRELEASE-THE DESERT GROUP XOLIXE/E. [April 21, 



Monocot.— Giovannozzi, Nnov. Giorn. Bot. Ital. n.s. 18; 9, 53. /. 14.— Gre- 

 villius, Bot. Notiser. 1887: 140.— Haberlandt, Ber. Deutsch. Bot. Ges. 4: 223.— 

 Hausmann, Beih. Bot. Centralbl. 23. Abt. 2: 43-80. #.— Kny, Bot. Wandtafeln. 

 Abt. 5.— Mobius, Ber. Deutsch. Bot. Ges. 5: 22.— Morot, Ann. Sci. Nat., Bot. 

 vi. 20 : 272.— Schoute, Flora. 92 : 42, 46. />/. 4- f- 5, /o.— Schwendener, Abhandl. 

 Akad. Berlin. 1882. 



EXPLANATION OF ILLUSTRATIONS. 



The distribution map indicates the occurrence of specimens actually 

 examined. Half-tone plates are from mipublished photographs by the author 

 unless otherwise credited. Text-cuts are uniformly reduced from enlarged 

 camera lucida drawings to natural size except that leaf sections are X 2, the 

 finer arming of leaf margins X 20, and the style and wing tips of Dasylirion 

 X 6; and a few exceptional details with other enlargement are introduced. 



Plates 1-4. Habit of growth: i, Trunkless (Nolina microcarpa, Arizona, 

 MacDougal) ; 2, with elongated finally erect caudex (Dasylirion lucidum, 

 Tehuacan) ; 3, arborescent (Nolina longijolia, cultivated in the Palermo 

 botanical garden) ; 4 arboreous {Bcaucarnea gracilis, Tehuacan). All greatly 

 reduced. 



Plate 5. Habit of inflorescence: — A, Simply panicled (Nolina gcorgiana 

 Georgia, Harper) ; B, Compoundly panicled (A''. Parryi, California, Jepson) ; 

 C, Compoundly spicate (Dasylirion ccdrosanum, Mexico, Lloyd). — All greatly 

 reduced. 



Plates 6-7. Inflorescence details : — 6 A, Nolina caudata (type) ; 6 B, 

 Calibanus Hookcrii (Purpus, 4775) ; 7 A, Beaucarnca giiatcmalensis (Keller- 

 man, 6069); 7 B, Dasylirion Wheelcri S and $ (Wooton, 72).— All natural 

 size. 



Pl.'\te 8. Flowers.— A, Nolina longijolia (Radlkofer) ; B, Calibanus 

 Hookerii (Rose, 8954); C, Bcaucarnea stricta (Purpus, 2397); D, Dasylirion 

 Wheelcri (Toumey). — All X 10. 



Plate 9. Septal nectar slits as shown on the matured fruit. A, Dasylirion 

 longissimum (Palmer); B, Calibanus Hookcrii (Purpus, 1200). — Both X 25. 



Plate 10. Seeds. A, three seeds of Nolina durangensis, — the middle one 

 sectioned to show coat, endosperm and embryo; a seed of Beaucarnca plia- 

 bilis; and two seeds of Dasylirion lucidum.— AW X 3. B. endosperm of 

 Dasylirion lucidum, with " reserve-cellulose " walls. X 200. C, cross section 

 of seed of Nolina durangensis showing embryo cavity with much extruded 

 protoplasm and oil— in chlor-iodide of zinc. X 20. D, endosperm of Nolina 

 durangensis swollen in chlor-iodide of zinc, with extruded oil. X 200. 



Plate ii. Fruit characters. A, four fruits and a seed of Nolina 

 georgiana; six fruits and two seeds of Dasylirion Wheelcri; six fruits and 

 two seeds of Beaucarnca gracilis; and four fruits and a seed of Calibanus 

 Hookcrii.— AW natural size. B, i, Dasylirion acrotriche (3 and 4-winged) ; 2, 

 D. acrotriche (4- and 5-winged) ; 3, D. durangcnsc (2- and 5-winged) ; 4, 

 D. Wheelcri (4- and 5-winged) ; 5, Calibanus Hookcrii (4-carpellary). — 

 All X 2. 



