CATALOGUE. II5 



long and 6" in diameter ; petals a light sulphur-yellow, fading with age, open 

 during the day. M. omata, with "white" flowers and bracteated calyx-tube, 

 was not met with. Stansbury's plant, so named, is Icevicaulis. From New 

 Mexico and Colorado to California and Washington Territory. On dry foot- 

 hills from the Washoe Mountains to Salt Lake; 4,500-6,000 feet altitude; 

 June-September. (432.) 



CACTACE^. 



BY DE. GEOEGE ENGELMANN. 



Mamillaeia^ (Etjmamillaeia) GtEAHAmi, Eng. G-lobose or oval, usually 

 simple, 1-3' high ; on the short oval close-set tubercles are numerous thin 

 but rigid whitish spines, 3-6" long, the outer 15-30 in a single series and 

 straight, surrounding a stouter and longer hooked brown one ; flowers small, 

 nearly 1' wide, reddish ; berry oval, green, with black pitted seeds. — Rocky 

 localities in Southern New Mexico, Arizona and the adjoining parts of Utah. 



Mamjllaeia phellospeema, Eng. Resembling the last, rather larger, 

 more oblong or cylindrical ; tubercles longer and less crowded ; spines more 

 numerous, the outer 40-60 in two series, the exterior bristle-like, the inner 

 more robust, with 3-4 brown central spines, of which one or more are 

 hooked ; flowers similar ; berry club-shaped, scarlet ; seed globose, with a 

 larger spongy brown appendage. — Gravelly soil in Southern Utah and Ari- 

 zona, rarer than the last. 



Mamillaeia (Coeyphantha) vivipaea. Haw., Var. Simple,' oval, the 

 almost terete tubercles bearing fascicles of 5-8 reddish-brown spines sur- 

 rounded by 15-20 grayish ones in a single series, all straight and very rigid, 

 the latter 5-8", the former even 10" long ; flowers purple, often 2' or more in 

 diameter, with numerous lance-subulate petals and fringed sepals ; berry oval, 

 green ; seed pitted, light-brown. — Near St. George, Southern Utah, (J. E. 

 Johnson.) Larger than the often csespitose forms of the eastern slopes and 



'MAMILLAEIA, Haw. Sepals and petals united beyond the naked ovary into a short tube. 

 Berry juicy, oval or club-shaped. Seeds brown or black ; embryo straight, -without albumen ; cotyledons 

 very short, globose. — Low globose or oval plants, simple or branched, covered with spine-bearing tuber- 

 cles; flowers rising from the axils of the tubercles, usually small, about as wide as long, opening in sun- 

 shine only. Comprising two sections : — 



§ ETJMAMILLAEIA, Esfo. Flowers from the axils of the older (never grooved) tubercles, 

 usually small. 



§ COEYPHANTHA, Eng. Tubercles grooved on the upper surface ; flowers usually large, from 

 the axils of the youngest often scarcely developed tubercles. 



