550 CUCURBITACEAE 



simplices vel ramis pan-is ad ba.sin, unc. 3-4 alti; flores eampaimlati albi unc. 

 1/^-% alti; fructus obovatus vol clavatus, unc. %-l lonfjus.) 



Canons, 1000 to 2000 feet: western borders of the Colorado Desert. Seldom 

 collected and little known; possibly only a form of IM. dioica K. Bdg. 



Locs. — Vallccito, Parish 450 (typo) ; Coyote Canon, Hall 2850; Dead Indian Canon, Jaeger; 

 Deep Canon, San Jacinto Mts., L. J. Childs; Shavers Well (e. of), Jones. 



Kefs. — Mammillaria inckrta Parish. M. grahamii Parish; Jepson, Manual 660 (1925); 

 not M. grahamii Engelm. (1856). 



5. CORYPHANTHA Lem. 

 Plants of the same form and habit as in the preceding genus, but tubercles 

 grooved on the upper side. Spines straight or hooked. Flowers campanulate, 

 produced among the nascent tubercles from the base of the groove. Ovary naked, 

 or rarely sparsely squamose. Fruit green or greenish, the withered perianth long 

 persisting. Seeds small, brown. — Species 36, North America. The genus has 

 generally been regarded as a section of Mammillaria, but consistency in the treat- 

 ment of the family is best preserv'ed by its recognition. (Greek koryphe, a cluster, 

 and anthos, flower.) 



Flowers straw-color or yellowish 1. C. chlorantha. 



Flowers purplish 2. C. alversonii. 



1. C. chlorantha Britt. & Rose. Foxtail Cactus. Stems simple, or 2 to 5- 

 branched at base, globose or short-cylindrical, 5 to 8 inches high; tubercles approxi- 

 mate; central spines 4 to 8, acicular, I/2 to 1 inch long, red or brown nearly to the 

 white base, all straight; radials 20 to 25, gray, bristle-like, concealing the surface; 

 flowers yellow or stramineous, about 1 inch high, the outer segments eiliate; fruit 

 oblong, sparsely spinose; seeds brown, flattish, minutely pitted. 



Hillsides and mesas, 150 to 5000 feet: eastern Mohave Desert; lower Colorado 

 River. East to Utah. Infrequent and scattered. 



Locs. — Ivanpah Mts., Parish 455 ; Black Pt., Kiverside Mts., Colorado River, Jepson 5252 ; 

 Bard, Imperial Co., Schellenger. 



Eefs. — CoRYPHANTHA CHLORANTHA Britt. & Eose, Cact. 4:43 (1823). Mammillaria chlor- 

 antha Engelm.; Eothr. Bot. Wheeler 127 (1878), type loc. s. Utah, east of St. George, Parry. 

 Cactus radiosus chloranthus Coult. Contrib. U. S. Nat. Herb. 3 :121 (1894). Mammillaria deserti 

 Engelm.; B. & W. Bot. Cal. 2:449 (1880), type loc. Ivanpah, Mohave Desert, Parish; Parish in 

 Jepson, Man. 660 (1925). Cactus radiosus deserti Coult. I.e. 121. Coryphantha deserti Britt. & 

 Rose, I.e. 46. 



2. C. alversonii Orcutt. Stems simple, or rarely 1 to 2-branched from the 

 base, short-cylindrical, 3 to 8 inches high; central spines 12 to 16, straight, dark 

 purple or black above the white base, I/4 to % inch long, very unequal and grading 

 into the equally long but slenderer radials, nearly concealing the surface ; flowers 

 light purple, the outer segments strongly eiliate; fruit clavate; seeds minutely 

 tuberculate. 



Gravelly mesas, 2000 to 4000 feet : ranges between the eastern Mohave Desert 

 and the Colorado Desert. Infrequent. It is a stouter plant than C. chlorantha, 

 and with stouter spines, but is separated mainly on the color of the flowers. May. 



Locs. — Dale, Hall 6036; Cottonwood Sprs., Parish 10,861; Chuckwalla Mts., Munz 4' -STecfc 

 5015 ; Anschutz Canon, Eagle Mts., Mum 4" J^eck 5013. 



Refs. — Coryphantha alversonii Orcutt, Cactography 3 (1926). Cactus radiosus alversonii 

 Coult. Contrib. U. S. Nat. Herb. 3:122 (1894), type loc. MacHaney's Mine, near Twenty-nine 

 Palms, Alverson. Mammillaria alversonii Coulter; Zeissold, Monat. Kaktkunde 5:70 (1895); 

 Parish in Jepson, Man. 660 (1925). M. radiosa var. alversonii Schum. Gesamtbeschreib. Kakt. 

 481 (1898). 



CUCURBITACEAE. Gourd Family 

 Herbs, mostly tendril-bearing and succulent, with simple palmately lobed 

 leaves. Flowers unisexual. Corolla 5 to 7-lobed, inserted on the calyx. Calyx- 

 lobes narrow or tooth-like. Calyx-tube in the pistillate flower adherent to the 1 



