36 THE CACTACEAE. 
_— 19. Coryphantha compacta (Engelmann). 
= Mammillaria compacta Engelmann in Wislizenus, Mem. Tour North. Mex. 105. 1848. 
Cactus compactus Kuntze, Rev. Gen. Pl. 1: 260. 1891. 
Plants solitary, somewhat depressed, 3 to 6 cm. high, 5 to 8 cm. broad; tubercles in 13 rows, 
much crowded, 8 mm. long, sulcate 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. 
Fic. 32.—Coryphantha nickelsae. Fic. 33.—Coryphantha compacta. 
The name Coryphantha compacta occurs in C. R. Orcutt’s Circular to Cactus Fanciers, 
1922. 
Illustrations: Cact. Mex. Bound. pl. 74, f. 2 (seeds); Dict. Gard. Nicholson Suppl. 
515. f. 548; Bull. U. S. Dept. Agr. Bur. Pl. Ind. 262: pl. 2, f. 1; Watson, Cact. Cult. ed. 2. 
254. f. 95; ed. 3. 76. f. 35, as Mammillaria compacta. 
Figure 33 is from a photograph of the plant collected by Dr. Rose. 
_» 20. Coryphantha radians (De Candolle). 
_> Mammillaria radians De Candolle, Mém. Mus. Hist. Nat. Paris 17: 111. 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. 1853. 
Coryphantha daimonoceras Lemaire, Cactées 35. 1868. 
Cactus radians Kuntze, Rev. Gen. Pl. 1: 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- 
