NEOMAMMILLARIA. 75 



Q. Neomammillaria heyderi (Miihlenpfordt). 



Mammillaria heyderi Miihlenpfordt, Allg. Gartenz. l6: 20. 1848. 

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

 ? Mammillaria buchheimeana Quehl, Monatsschr. Kakteenk. 27: 97. 1917- 



Plant globose or somewhat flattened at apex; tubercles conic, 12 mm. long, when young bearing 

 wool in their axils; young spine-areoles white-woolly; radial spines 20 to 22, white, setaceous, the 

 lower ones stouter and longer; central spine solitary, brown at base and apex, 5 to 6 mm. long; 

 flowers pinkish, the segments linear-oblong; fruit oblong, red. 



Type locality: Not cited. 



Distribution: Texas and northern Mexico. 



Illustration: Schulz, Wild Fl. San Antonio pi. 13 in part, as M. heyderi. 



Plate VIII, figure 2, shows a plant sent to Dr. Rose by Mrs. S. L. Pattison in 192 1 which 

 flowered in the New York Botanical Garden on April 21 of that year; figure 2a shows the 

 fruit. 



Fig. 67. — Neoma 



lillaria macdoiigalii. 



Fig. 68. — Neomammillaria phymatolliele. 



10. Neomammillaria hemisphaerica (Engelmann). 



Mammillaria hemisphderiiii lingelmann in Wislizenus, Mem. Tour North. Mex. 105. 1848. 

 Mammillaria heyderi hemisphaerica Engelmann, Proc. Amer. Acad. 3: 263. 1856. 

 Cactus heyderi hemisphaericus Coulter, Contr. U. S. Nat. Herb. 3: 97. 1894. 

 Cactus hemisphaericus Small, Fl. Southeast. U. S. 8n. 1903. 



Deep-seated in the soil, hemispheric, 8 to 12 cm. broad, dark green; tubercles only slightly 

 angled, not very closely set, i to 1.5 cm. long, somewhat pointed, their axils nearly naked in the 

 dormant stages; spine-areoles woolly when young, becoming glabrate in age; radial spines 9 to 13, 

 widely spreading, acicular, the upper ones more delicate, 4 to 8 mm. long, brownish or smoky, often 

 with black tips; central spine solitary, porrect, brown; flowers small, cream-colored, i to 1.5 cm. long; 

 inner perianth-segments acute; filaments pinkish; style pinkish; stigma-lobes 6 to 10, greenish 

 yellow; fruit slender, clavate, red, i to 1.5 cm. long. 



Type locality: Below Matamoros on the Rio Grande. 



Distribution: Southeastern Texas and northeastern Mexico; 



This species was collected in 1846 by the St. Louis Volunteers in the Mexican War and 

 taken back to Dr. George Engelmann; it flowered and he described it briefly in 1848 and 

 in more detail in 1850. It was recently re-collected near Brownsville, Texas, just across 

 the river from Matamoros by Robert Runyon and sent to us with a photograph taken 

 in situ, here reproduced (plate vi, figure 2). 



