36 



THE CACTACEAE. 



19. Coryphantha compacta (Engelmann). 



Mammillaria compacta Engelmann in Wislizenus, Mem. Tour North. Mex. 105. 1848. 

 Cactus conipaclus Kuntze, Rev. Gen. PI. i: 260. 1891. 



Plants solitary, somewhat depressed, 3 to 6 cm. high, 5 'o 8 cm. broad; tubercles in 13 rows, 

 much crowded, 8 mm. long, sulcata above; radial spines 14 to 16, rigid, appressed. interwoven with 

 adjacent ones, whitish, 10 to 20 mm. long; central spines usually wanting; flowers 2 cm. long and 

 broad, yellow ; fruit oval ; seeds smooth and yellow. 



Type locality: Cosihuiriachi, Chihuahua. 



Distribution: Mountains of Chihuahua. 



This species had long been known only from the original plant collected by Wislizenus, 

 but in 1908 Dr. Rose visited the type locality, where he re-collected the plant, which later 

 flowered at Washington. 



Fig. 32. — Coryphantha nickelsae. 



Fig. 33. — Coryphantha compacta. 



The name Coryphantha compacta occurs in C. R. Orcutt's Circular to Cactus Fanciers, 

 1922. 



Illustrations: Cact. Mex. Bound, pi. 74, f. 2 (seeds) ; Diet. Gard. Nicholson Suppl. 

 515. f. 548; Bull. U. S. Dfept. Agr. Bur. PI. Ind. 262: pi. 2, f. i ; Watson, Cact. Cult. ed. 2. 

 254. f. 95; ed. 3. 76. f. 35, as Mainmillaria compacta. 



Figure 33 is from a photograph of the plant collected by Dr. Rose. 



20. Coryphantha radians (De Candolle) . 



Mammillaria radians De Candolle, Mem. Mus. Hist. Nat. Paris 17: iii. 1828. 



Mammillaria impexicoma Lemaire, Cact. Aliq. Nov. 5. 1838. 



Mammillaria daimonoceras Lemaire, Cact. Aliq. Nov. 5. 1838. 



Mammillaria radians globosa Scheidweiler, Bull. Acad. Sci. Brux. 5: 494. 1838. 



Mammillaria cornifera impexicoma Salm-Dyck, Cact. Hort. Dyck. 1849. 20. 1850. 



Echinocactus corniferus impexicomus Poselger, Allg. Gartenz. 21 : 102. 1853. 



Echinocactus radicans Poselger, Allg. Gartenz. 21 : 107. . 853. 



Coryphantha daimonoceras Lemaire, Cactees 35. 1868. 



Cactus radians Kuntze, Rev. Gen. PI. i: 261. 1891. 



Cactus radians pectinoides Coulter, Contr. U. S. Nat. Herb. 3: 114. 1894. 



Mammillaria radians impexicoma Schumann, Gesamtb. Kakteen 495. 1898. 



Mammillaria radians daemonoceras Schumann, Gesamtb. Kakteen 496. 1898. 



Solitary, globose, either obtuse or depressed at the top, 7.5 cm. in diameter; tubercles ovoid, 

 lar e; axils of tubercles naked; areoles glabrate; spines all radial, 16 to 18, white or sometimes yel- 



