CORYPHANTHA. 



43 



30. Coryphantha chlorantha (Engelmann). 



Mammillaria chlorantha Engelmann in Rothrock, Rep. U. S. Geogr. Surv. 6: 127. 1878. 

 Cactus radiosus chlorauthus Coulter, Contr. U. S. Nat. Herb. 3: 121. 1894. 

 Mammillaria radiosa chlorantha * Schumann, Gesamtb. Kakteen 481. 1898. 



Plant cylindric, sometimes 20 to 25 cm. high, 8 cm. in diameter; tubercles closely set and entirely 

 hidden by the densely matted spines; flowers small, 35 mm. broad; outer perianth-segments cihate; 

 inner perianth-segments yellow or greenish yellow, linear-lanceolate, acute; stigma-lobes white; 

 fruit central, green, 2.5 cm. long, juicy, bearing 5 or 6 scales near top; seeds brown, flattened, 1.5 

 mm. long, reticulated. 



Type locality: Southern Utah, east of Saint George. 



Distribution: Southern Utah, western Arizona, central Nevada, and eastern southern 

 California. 



Mammillaria utahensis Hildmann, cited by Schumann (Gesamtb. Kakteen 481. 

 1898) as a synonym of M. radiosa, may have been based on this plant. 



Illustrations: Forster, Handb. Cact. ed. 2. 328. f. 33; Gartenfiora 32: 87; Deutsche 

 Gart. Zeit. 7: 53, as Mammillaria chlorantha; Schelle, Handb. Kakteenk. 236. f. 151, as 

 M. radiosa chlorantha. 



Plate V, figure 7, is from a plant collected by I. Tidestrom at the type locality in 1919, 

 which flowered in the New York Botanical Garden, May 27, 1919. Figure 42 is from a 

 photograph of a plant collected by Major E- A. Goldman in Prospect Valley, Arizona. 



Figs. 40 and 41. — Coryphantha durangensis. 



31. Coryphantha vivipara (Nuttall) Britton and Rose in Britton and Brown, Illustr. Fl. ed. 2. 2: 

 571- 1913- 



Cactus viviparus Nuttall, Eraser's Cat. No. 22. 1813. 

 Mammillaria vivipara Haworth, Suppl. PI. Succ. 72. 1819. 

 Mammillaria radiosa Engelmann, Bost. Journ. Nat. Hist. 6: 196. 1850. 

 Echinocactus radiosus Poselger, AUg. Gartenz. 21: 107. 1853. 

 Echinocactus viviparus Poselger, AUg. Gartenz. 21: 107. 1853. 

 Mammillaria vivipara vera Engelmann, Proc. Amer. Acad. 3: 269. 1856. 

 Mammillaria vivipara radiosa Engelmann, Proc. Amer. Acad. 3: 269. 1856. 

 Mammillaria vivipara radiosa Engelmann, Cact. Mex. Bound. 15. 1859, as subspecies. 

 Cactus radiosus Coulter, Contr. U. S. Nat. Herb. 3: 120. 1894. 

 Mammillaria hirschtiana Haage, Monatsschr. Kakteenk. 6; 127. 1896. 

 Coryphantha radiosa Rydberg, Fl. Rocky Mountains 581. 1917. 



* Schumann credits this trinomial to Engelmann at the place here cited, although we believe that Engelmann 

 never used it. 



