226 CACTACEZ OF CLARENCE KING’S EXPLORATION. 
which many tropical species must be referred, and also a few which lately have been classed with Pilocereus ~ is dis- 
tinguished from the latter by the uniformity of the fertile and sterile branches and areolx ; while in Pilocereus the 
fertile areolz are closer together, and densely beset with bristly spines or long wool. Eucereus, in a more restricted 
sense than Miquel has used it in his Genera, or 9 in the Synopsis, would comprise the largest number of Cerei of the 
second division, of very different external shape, and would probably have to be again subdivided when we get to 
know more of the fructification of the different species. Neither Echinopsis nor Phyllocactus do in their flowers differ 
from Eucereus; and Disisocactus is but a depauperate Phyllocactus, with scarcely more than the crown of stamens 
left, a few single ones representing the great mass of inner stamens of the allied sections. I am as yet undecided 
whether Epiphyllum, as restricted by Prince Salm, has also to be united with Cereus or not. The fasciculated declined 
stamens spring from the whole tube; the exterior ones form no crown, but the innermost ones are separated from the 
rest, and form, with their confluent bases, a kind of vault, which is arched over the base of the tube. I have had no 
opportunity to examine fruit and seed. 
am not sure whether the true Cereus variabilis is also found on the lower Rio Grande. A specimen in 
Mr. Geebel’s horticultural establishment, said to come from that region, has repeatedly flowered and borne fruit. 
flowers opened in May, and the fruit ripened after ten or eleven months. Flower 9 inches long, white, open 
only at night ; ovary angular, with 5 or 6 triangular scales, but no spines; long tube with about 8 per [204] 
crown of exterior stamens distant from the others 8 or 9 lines; about 10 filiform spreading stigmas. Frui 
irregularly oval, about 2 inches long, naked, deep violet-purple, at last bursting and dropping seeds and ae Seed 
quite different from that of the last species, very obliquely Peat meet curved from a narrow base, with an 
orbicular hilum, 0.9 line long, smooth, shining, with a few i dot: 
Through the kindness of Dr. A. W. Chapman, of Kisii Florida, I have received living specimens and 
fruit of the little southeastern sea-coast Opuntia, so that I can now complete and correct the description of this very 
distinct species. 
Opuntia Pes Corvi, Le Conte in herb; Engelm. App. to Synops. Cact. in Proc. Amer. Acad. Arts and Sci, 
III. p. 346; Chapm. South. Flora, p. 145: lete viridis, diffusa; articulis parvis ovatis seu obovatis tumidis sepius 
teretiusculus fragilibus; pulvillis pulvinatis ; foliis ovatis cuspidatis incurvis ; areolis junioribus albo-tomentosis setas 
parcas brevissimas pallidas et plerisque aculeos 1-3 rectos rigidos seepe basi compressos tortosque obscuros gerentibus, 
infimis inermibus ; floribus minoribus flavis ; ovario obovato pulvillis perpaucis fusco-villosis stipato ; sepalis exteriori- 
bus ayato-lanceolatia, interioribus obovatis cuspidatis; petalis sub-5 obovatis spatulatis obtusis ; stigmatibus 4-5 
erectis ; seminibus paucissimis anguste obtuseque marginatis in pulpa viscosa bacce sepe floris rndimentis coronate 
nidulantibus. 
n sands along the coast of Georgia and Florida. — Joints 1-3 inches long, obovate, tumid, or narrower and 
subcylindric, usually many of them growing in the same season, one from the top of the last one, till they at last 
become prostrate and 1 or 2 feet long; pulvilli somewhat prominent, 4, 6, or even 8 lines apart ; leaves 2}-3} lines 
long ; spines 1-1} inches long, very straight, when in threes divergent. Flowers 14-1} inches in diameter; sepals 
and petals less numerous and narrower than in any allied species ; ovary 4 inch long, with only 2 or 3 areole on its 
surface and 3-5 on its upper edge. Fruit obovate, 6-7 lines long, rose-purple, with a shallow umbilicus ; areolie 
almost obliterated. Seeds 2 lines in diameter, 1-3, rarely as many as 5, in one fruit. Evidently near 0. vulgaris, from 
which the shape and armature of the joints sufficiently distinguish it ; far removed from 0. fragilis, with which at 
first glance the tumidity and fragility of the joints would seem to connect it. 
XI. CACTACEZ OF CLARENCE KING’S EXPLORATION OF THE FORTIETH 
PARALLEL. VoL. V. Botany, By SERENO WATSON. P. 115-120. 1871. 
Maminnaria (EUMAMILLARIA) GRAHAMI, Engelm. Globose or oval, usually simple, 1-3 inches high. [115] 
On the short, oval, close-set tubercles are numerous thin but rigid whitish spines, 3-6 lines long ; the outer 
15-30 in a single series and straight, surrounding a stouter and longer hooked brown one. Flowers small, nearly 
1 inch wide, reddish ; berry oval, green, with black pitted seeds. — Rocky localities in southern New Mexico, Arizona, 
and the adjoining parts of Utah. 
M. PHELLOSPERMA, Engelm. Resembling the last, rather larger, more oblong or cylindrical ; tubercles longer 
and crowded. Spines more numerous; the outer 40-60 in two series, the exterior bristle-like, the inner more 
robust, with 3-4 brown central spines, of which one or more are hooked. Flowers similar; berry club-shaped, 
