114 



THE CACTACEAE. 



69. Neomammillaria aureiceps (Lemaire). 



Mammillaria aureiceps Lemaire, Cact. Aliq. Nov. 8. 1838. 



MammiUaria rhodantha aureiceps Salm-Dyck, Cact. Hort. Dyck. 1844. 7. 1845. 



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



Globose to short-oblong, 8 to 10 cm. in diameter; tubercles short, terete in section, woolly and 

 setose in their axils; radial spines about 20, bristle-like, white, 5 to 8 mm. long, spreading; central 

 spines several, sometimes as many as 9, yellow, stouter and longer than the radials, 10 to 14 mm. long, 

 somewhat spreading and a little cun-ed inward: flowers small, dark red. 



Type locality: Mexico. 



Distribution: Valley of Mexico. 



Our description is based on specimens recently sent us by Dr. Karl Reiche as Mam- 

 millaria rhodantha, under which name it usually passes. Jl/. rhodantha, however, has dif- 

 ferent spines and is more strictly a mountain species. 



Plate IX, figure 3, shows a plant sent from the Edinburgh Botanical Garden in 1902 as 

 Mammillaria rliodantha which flowered in the Xew^ York Botanical Garden, October 15, 

 191 2. Figvu^es 117 and iiS give two views of this plant sent us by_Dr. Reiche from the 

 Valley of Mexico. 



i 



Fig. 119. — Xeomamniillaria yucatanensis. 



-Neomanunillaria ruestii. 



70. Neomammillaria yucatanensis sp. nov. 



Plants in clumps of 4, erect, cylindric, not milky, 10 to 15 cm. long, 3 to 6 cm. in diameter, ver\^ 

 spiny; tubercles conic, woolly in their axils but not setose; radial spines about 20, white, spreading, 

 aciciilar; central spines 4 or rareh- 5, much stouter than the radials, 6 to 8 mm. long, slightly spread- 

 ing above, yellowish brown; "flowers ver\' small, rose; fruit oblong, bright red." 



Collected by George F. Gaumer at Progreso, Yucatan, Mexico, in 1918 (No. 23939) 

 and again in 192 1 (No. 24367, t}^e). 



■\Ve have not seen this species in flower or fruit but Dr. Gaumer has described them as 

 above. He says that the plant is rare on the land side of the coastal marshes. 



Figure 119 is from a photograph of the plant sent in 192 1 b}' Dr. Gaumer. 



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