140 SYNOPSIS OF THE CACTACEZ OF THE UNITED STATES. 
26. C. Emory, E. in Sill. Journ. 1852: prostratus ; ramis adscendentibus 15-costatis ; areolis confertis ; 
aculeis setaceis rigidis flavis, radialibus 40-50 stellatis, centrali unico longiore robustiore ; flore flavo herve [287] 
culo ; bacca aculeatissima ; seminibus magnis lucidis. 
On hills near a ego, California, growing in thick patches. — Stems several feet long ; branches 6-9 inches 
high, 13 inches in diameter. Fruit very spinose, with seeds over one line in length. 
27. C. VARIABILIS, : ee : erectus, 3-4-angulatus ; areolis remotis; aculeis 4-6 brevibus radiantibus, 2—4 inte- 
rioribus validis elongatis inzequalibus divaricatis, centrali deflexo ; flore magno albo nocturno ; bacca coccinea aculeo- 
lata ; seminibus magnis levibus 
On the lower Rio Grande : flowers in May and June.— Well known from all parts of tropical America. Stem 3 to 10 
feet high, 2 inches in diameter ; larger spines 12-18 lines long. Fruit 2-3 inches long, nearly 2 inches in diameter. 
28. C. Greaan, E. in Wisliz. Rep. : gracilis, e radice crassa napiformi erectus ; ramis 3-6-angulatis, rufescenti- 
bus; areolis confertis ; aculeis e basi bulbosa abrupte subulatis brevissimis nigricantibus, radialibus 6-9, centralibus 
1-2; floris elongati albidi tubo aculeolis capillaceis flexuosis munito ; bacca sessili obovata apice rostrata ; seminibus 
rugosis, Var. a. CISMONTANUS: areolis elongatis; petalis latioribus. Var. 8. TRANSMONTANUS: areolis ovato- 
orbiculatis ; petalis angustioribus. 
exas to Sonora, and south to Chihuahua: flowers May and June. — Root a large fleshy tuber, some- 
times 6 inches in diameter. Stems 2-3 feet high, 9-12 lines thick, usually 4- or 5-angled; spines }~1 line long, very 
sharp ; lower ones longer. Flower 6 or 8 inches long, 2-2} wide. Fruit 1-1} inches lous: Seed 1-14 lines in 
Subgen. 3, Leprpocergvs. Caulis elongatus : fasciculi aculeorum steriles et florigeri similes : floris tubus bre- 
vior squamosus: phylla numerosissima : stigmata pallida : semina levia: embryo hamatus. 
29. C. GIGanTEvs, E. in Emory’s Rep. 1848: erectus, elatus, parce erecto-ramosus, 18-21-costatus ; aculeis 12-16 
radialibus inzequalibus, centralibus sub-6 robustis basi bulbosis corneis basi nigris ceeteros superantibus, infimo longiore 
deflexo ; Rape subterminalibus albidis ; bacca obovata demum 3-4-valvi. 
m the lower Gila north to Williame’s River (better known among Western travellers as Bill Williams’s [288] 
Fork), ae south into Sonora: flowers May-July; fr. July and August. — A now well-known plant to travellers 
and botanists, 30-50 feet high, 1-2 feet in diameter; central spines 14-23 inches long. The yellowish-white flower 3-4 
inches long. Fruit 2-3 inches long, often ids tie and opening with 3 or 4 irregular recurved valves. 
30. C. THuRBERI, E. in Sill. Journ. 1854: caulibus erectis vel adscendentibus pluribus elatioribus articulatis 
13-14-costatis ; aculeis 7-15 aathen cineabin valde inequalibus ; ovario tuboque imbricato-squamato ; bacca glo- 
bosa magna. 
Sonora, west of the Sierra Madre: flowers June and July. — Stems 5-15 from one root, 10-15 feet high, 4-6 inches 
in diameter ; spines slender, flexible, from 5-18 lines long. Flowers 3 inches long, white. Fruit like a large orange, 
of delicious flavor. 
ubgen. 4. PrLocEREvS. Caulis elatus : fasciculi aculeorum steriles a floriferis tenuioribus longioribus distincti : 
floris tubus brevis squamosus : phylla pauciora: stigmata pallida: semina levia: embryo hamatus (in specie nostra !). 
31. C. Scnorrn, E. in B. C. R.: caulibus erectis vel adscendentibus pluribus elatioribus articulatis 4—7-costatis ; 
areolis in articulis seevitions remotis ; aculeis brevibus robustis, radialibus 4-6, centrali unico ; areolis in articulis flori- 
feris confertis ; aculeis 15-25 longioribus setaceis flexuosis e rubello cinereis ; floribus carneis minoribus, tubo gracili 
decurvo ; bacca 
Sonora, towards Santa Magdalena : flowers July. Stems 8-10 from the same base, often growing in dense clusters, 
8 or 10 feet high, with 2-4 articulations, 4 or 5 inches in diameter. Spines of the sterile part of the plant 3-4 lines long, 
on the fertile joints 1-4 inches long, pendulous, forming a reddish-gray beard, in which the flower (not 2 inches long) 
is somewhat hidden. Seeds large : cotyledons hooked, exactly as in the last two species. This is ev idently a Piloce- 
reus, but with the seed of a true Cereus, thus reuniting the former with the latter. 
Trisus II. ROTATZ, Miquet. 
Aphylle seu foliose. Flores tubo abbreviato subrotati. Cotyledones facie versus hilum spectantes seminis 
lateri contrarie (incumbentes). 
IV. OPUNTIA, Tourn. [289] 
sepalis subulatis caducis axilla pulvilligeris instructum. Semina magna, compressa, discoidea, seepe 
Rasy abide Crledones foliaceew, circa albumen curvate, plerumque incumbentes. — Plante articula ate 5 
articulis complanatis seu teretibus plus minus tuberculatis ; foliis subulatis caducis axilla pulvillos setosos pleramque 
aculeiferos gerentibus ; aculeis apice retrorsum hispidis. 
