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DESCRIPTION OF THE CACTACEÆ.
BY GEORGE ENGELMANN
, M. D. OF ST. LOUIS, AND JOHN M. BIGELOW, M.D.
I. Eumamillaria. Englm. in Synops. Cact.
1. Mam. Wrightii, Englm. in Rep. of Bound. Com.: Flowers and fruit
were unknown until specimens brought from the Pecos flowered in Washington. From these the following descrip-
tion was drawn:
“Sepalis exterioribus triangularibus obtusiusculis fimbriatis sub-13, interioribus margine
petaloideis acutis sub-8, petalis (purpureis) lanceolatis acuminatis aristatis sub-12; bacca
succosa majuscula purpurascente floris rudimentis coronata; seminibus obovatis basi acutis scro-
biculatis nigris. I am not certain whether the flower is actually lateral and the
germen immersed, whether, therefore, this species actually belongs to the true Mamillariæ, or to the subgenus Coryphantha
; I am, on the contrary, inclined to consider at least the germen emersed. I, nevertheless, think it best to leave this species with the Crinitæ, to which it seems to be so nearly allied, till more complete observations establish the contrary. The flower
is about one inch long, petals and margin of inner sepals bright purple; berry large and pur-
plish; seeds about 0.7 lines long.”
High plains near the Gallinas. Hills and rocky places near Anton Chico, on the Pecos,
September 25, 1858. Santa Rite del Cobre mountains, near Lake Santa Maria, Chihuahua.
Wright and Bigelow, in boundary collections.
2. Mam. Grahami, Englm. in Rep. B. C. Sand and gravelly banks of streams. Williams’river to the Colorado Grande, January 26, 1854.
3. Mam. phellosperma
, Englm. in Synops. Cact. (M. tetrancistra Englm. in Sillim. Jour., Nov. 1852): Living specimens of this and the preceding species have been brought to Wash-
ington, and are now growing in the Congressional garden. Few specimens only show more
than one of the 4 central spines hooked. The manifestly improper name previously adopted
had therefore to be altered. “I have substituted for it a name derived from the peculiar spongy
or corky appendage of the seed, which greatly resembles that of the seed of Potenttilla paradoxa, Nutt.”—(Engelmann.) Sandy banks of streams, Colorado Grande and Mohave, February 4–23, 1854. The external habit of this plant very much resembles that of M. Grahami, and it was collected in nearly the same localities.
4. Mam. meiacantiia, Englm. in Rep. B. C.: Distinguished from M. applanata by the fewer and stouter spines, central spine often wanting. Cedar plains near the Llaño Estacado to the
Pecos, September 23–27, 1853.
Bibliothèque numérique d'ouvrages sur les Cactus et Plantes Succulentes, https://www.cactuspro.com/biblio/
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