CORYPHANTHA. 



25 



24. C. cornifera 



25. C. salm-dyckiana 



C. pallida 



C. pycnacantha 



C. poselgeriana 



28. C. echinus 



HH. Central spines one to several. 



I. Central spines strongly hooked 23. C. palmeri 



II. Central spines straight or at most curved. 

 J. Central spines more or less curved. 



Central spine one, sometimes more in No. 25 

 Radial spines nearly as long as central . . . 

 Radial spines about half as long as central . 

 Central spines several. 



Radial spines 20 or more 26 



Radial spines 12 or fewer 27, 



JJ. Central spines straight. 



Radial spines, two kinds (to be looked for here) . 5 . 

 Radial spines of one kind. 



Plant almost hidden under mass of spines 



fruit oblong 



Plant not hidden under mass of spines; fruit 



globular 29. C. durangensis 



DD. Outer perianth-segments ciliate. 



Flowers yellow 30. C. cMorantha 



Flowers purplish to pink. 



Inner perianth-segments linear or lanceolate. 



Stigma-lobes purple, apiculate 31. C. vivipara 



Stigma-lobes white, obtuse or notched. 

 Flowers 4 to 7 cm. broad, rose to purple. 



Plants mostly solitary; inner perianth-segments broadly linear 32. C. neo-mexicana 

 Plants mostly cespitose; inner segments linear-lanceolate. ... 33. C. arizonica 



Flowers very short, 3 cm. broad, light pink 34. C. deserti 



Inner perianth-segments oblanceolate 35. C. aggregata 



hkk. Seeds black, angled; flowers minute. Series Cubenses 36. C. cubensis 



AA. Ungrouped species 37. C. sulcata 



1. Coryphantha macromeris (Engelmann) Lemaire, Cactees 35. 1868. 



Mammillaria macromeris Engelmann in Wislizenus, Mem. Tour North. Mex. 97. 1848. 



Mammillaria heteromorpha Scheer in Salm-Dyck. Cact. Hort. Dyck. 1849. 128. 1850. 



Echinocactus macromeris Poselger, AUg. Gartenz. 21: 102. 1853. 



Echinocactus heteromorphus Poselger, AUg. Gartenz. 21: 126. 1853. 



Mammillaria dactylilhele Labouret, Monogr. Cact. 146. 1853. 



Cactus macromeris K-untze.Rev. Gen. P\. 1:260. 1891. 



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



Plant branching at base, often many-headed, up to 

 2 dm. long; tubercles large, soft, loosely arranged, elon- 

 gated, 12 to 30 cm. long, grooved on upper side about 

 two-thirds of their length; spines 10 to 17, slender, the 

 radials white ; central spines several, black, the longer ones 

 5 cm. long; flowers large, purple, 6 to 8 cm. broad; scales 

 on flower- tube ciliate; ovary bearing a few scales with 

 hairy axils; fruit 15 to 25 mm. long; seeds globose, 

 brown but sometimes described as yellow, smooth. 



Type locality: Near Doiiana, New Mexico. 



Distribution: Southern New Mexico, western 

 Texas, and Chihuahua, south to Zacatecas, Mexico. 



This species and the follovi^ing one are not 

 closely related to the others of this genus. The 

 tubercles are much more elongated and flattened, 

 and the groove on the upper surface never extends 

 to the base. Sometimes a branch or bulblet is pro- 

 duced instead of a flower. 



Here may belong Coryphantha heteromorpha 

 Lemaire (Cactees 34. 1868) ; this name is apparently 

 erroneously referred to in the Index Kewensis (i : 

 624) as Coryphantha heierophylla (see Ariocarpus 

 fissuratus, Cactaceae 3: 83). 



Mammillaria brownii Toumey was erroneously referred here by Schumann. 



Mammillaria macromeris var. longispina and var. nigrispina are mentioned by Schelle 

 (Handb. Kakteenk. 237. 1907). 



-Tubercles of Coryphantha macromeris. 



