PAINTER — REVISION OF SUBGENUS CYCLOBOTHRA. 345 



the name 0. splendent Dougl. Calochortus weedii Wood and C. albus 

 Dougl. may be found in northern Lower California, for they have been 

 collected by both Mr. Brandegee and Mr. Le Roy Abrams close to the 

 border line. 



In the preparation of this paper I am especially indebted to Dr. 

 B. L. Robinson, curator of the Gray Herbarium, for the loan of the 

 specimens in his charge, among them many types of Doctor Watson, 

 and to Dr. J. N. Rose, Dr. E. L. Greene, and Mr. Wm. R. Maxon for 

 many valuable suggestions as the work progressed. 



KEY TO THE SPECIES. 



Flowers erect. 



Petals yellowish or with a lilac tinge. 



Sepals (and petals) yellow. North Mexican. . 1. C. venustulus. 

 Sepals lilac or purplish. Central or South 

 Mexican. 

 Plant 30 cm. or more high, capsule one- 

 sixth as broad as long 2. C. ghiesbreghtii. 



Plant under 25 cm. high, capsule one-third 



as broad as long 3. C. exilis. 



Petals (and sepals) dark brown or almost black.. . . 4, C. pringlei. 

 Flowers horizontal or nodding at anthesis. 

 Cauline leaves dilated at base. 



Inner surface of petals perfectly glabrous 5. C. grandiflorus. 



Inner surface of petals more or less covered with 

 hairs. 

 Hairs restricted to mid vein and to margin. 6. C. hartwegi. 

 Hairs not restricted to midvein and to 

 margin. 



Flowers nodding at anthesis 7. C. cernuus. 



Flowers horizontal at anthesis. 



Anthers under 0.25 cm. long 8. C. spatulatus. 



Anthers over 0.4 cm. long 9. C. purpureas, 



Cauline leaves not dilated at the base. 



Petals oval to rhombic, generally yellow 



throughout 10- C.barbatus. 



Petals oblong, acuminate, purplish at base.. . . 11. C. barbaius chihuahuanus. 



1. CALOCHOBTUS VENUSTULUS Greene. 



Calochortus venustulus Greene, Pittonia 1: 158. January, 1888. "On the higher 

 Sierra Madre back of the city of Durango, Mexico, altitude 8,100 feet, A. Forrer, 

 autumn of 1881." 



Calochortus madrensis S. Wats. Proc. Amer. Acad. 23: 283. May, 1888. . On pine 

 plains at the base of the Sierra Madre, Chihuahua, C. G. Pringle (n. 1382), September, 



1887." 



Stem 10 to 30 cm. high, branching, from a fibrous-coated conn 1 cm. in diameter; 

 leaves all linear, the basal broader, generally single; flowers erect, yellowish, on 

 slender peduncles about equaling the leaves; sepals oblong, obtuse, mucronulate, 1.2 

 to 2 cm. long; petals equaling the sepals, cuneate-obovate, naked above but hairy 

 below and of the same color; gland obscure or obsolete; anthers 2 to 3 mm. long. 



Distribution: In the Sierra Madre of Chihuahua and Durango. 



