VOL. 111.] Mamillaria Notesteinii Britton. 349 



glands: leaves ovate-lanceolate, 2-3 cm. in length on slender petioles 

 more than half as long, the uppermost reduced to sessile bracts: 

 proper bracts lighter green than the leaves, ovate-lanceolate, a pair 

 sessile in each of the upper axils, 8-12 mm. long, nearly twice the 

 length of the concealed calyx: flowers sessile, one or two in each 

 pair of bracts: calyx cleft to the base, lobes lanceolate-acuminate: 

 corolla rose-color 3-4 cm. long, the rather slender tube somewhat 

 curved and a little longer than the nearly equally cleft and spreading 

 lobes: anther cells muticous, parallel, one very slightly lengthened 

 below: capsule oblong, 2 cm. long, the stipe-like portion occupying 

 half the length; seeds flattened but thick, apparently violet in color, 

 covered with short, sinuous ridges. 



This plant was found growing about a spring on the Sierra Mata- 

 pan. Its habit and flowers resemble those of related species, but its 

 large bracts, of a lighter color than the leaves, make this a very 

 distinct one, and the numerous blossoms crowded at the upper part 

 of the stems surpass in beauty those of the well-known members 

 of the genus Anisacanthus. 



MAMILLARIA NOTESTEINII Britton. 



Since the sending of my first specimen to Dr. Britton I have founil 

 quite a plantation of them, and after examining a number h;)ve 

 thought it best to modify the original description. 



»/ Mamillaria Notesteinii Britcon, stems ovate, simple, or occa- 

 sionally caespitose, 2 — 8 cm. in diameter. Tubercles nearly terete and 

 ab^ut 2 cm. long, spines 12 — 18 white, becoming gray with age, 

 weak and slender, i — 2 cm. long, spreading. The central spine, 

 which is longer and stronger than the others, is generally tipped with 

 reddish-pink. Pubescent throughout. Flowers 2 — 4 cm. in diame- 

 ter, ash-gray, tinged and penciled with a delicate pink. Petals linear 

 oblong, mucronate tipped; sepals fringed; fruit scarlet, obovate; seed 

 black, globose, pitted. Soil and exposure to sunshine changed the 

 amount of coloring and penciling. 



Found by the writer in gravelly soil, near a small creek, in this 



(^ vicinity, June 4, 1891. F. N. Notestein. 



College of Montana, Deer Lodge, Mont. 



