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32 
among western travellers as Bill Williams’s Fork), and south into 
Sonora: fl. May-July; fr. July and August.—A now well-known 
plant to travellers and botanists, 30- 50 feet high, 1-2 feet in diam¬ 
eter ; central spines 1J - 2| inches long. The yellowish-white 
flower 3-4 inches long. Fruit 2-3 inches long, often pear-shaped, 
and opening with 3 or 4 irregular recurved valves. 
30. C. Thurberi, E. in Sill. Journ. 1854: caulibus erectis vel ad- 
scendentibus pluribus elatioribus articulatis 13 - 14-costatis; aculeis 
7-15 gracilibus fusco-atris valde insequalibus; ovario tuboque im- 
bricato-squamato ; bacca globosa magna. 
Sonora, west of the Sierra Madre : ft. 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. 
Subgen 4. Pilocereu%. Caulis elatus : fasciculi aculeorum steri- 
les a floriferis tenuioribus longioribus distincti: floris tubus brevis 
squamosus: phylla pauciora : stigmata pallida : semina lsevia: em¬ 
bryo hamatus (in-specie nostra !). 
31. Ci Schottii, E. in B. C. R.: caulibus erectis vel adscendenti- 
bus pluribus elatioribus articulatis 4-7-costatis ; areolis in articulis 
sterilibus remotis ; aculeis brevibus robustis, radialibus 4-6, centrali 
unico ; areolis in articulis floriferis confertis ; aculeis 15-25 longiori¬ 
bus setaceis flexuosis e rubello cinereis ; floribus carneis minoribus, 
tubo gracili decurvo ; bacca parva. 
Sonora, towards Santa Magdalena : fl. 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 : coty¬ 
ledons hooked, exactly as in the last two species. This is evidently a 
Pilocereus , but with the seed of a true Cereus, thus reuniting the 
former with the latter. 
Trib. II. ROTATiE, Miquel. 
Aphyllse seu foliosse. Flores tubo abbreviato subrotati. Cotyle- 
dones facie versus hilum spectantes seminis lateri contrarise (incum- 
bentes). 
