426 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Lemaireocereus stellatus (Pteiff.). Puate LXIX. 
Cereus stellatus Pfeiff. Allg. Gartenz. 4: 268. 1836. 
Cereus dyckii Mart.; Pfeiff. Enum. Cact. 87. 1837. 
Cereus tonellianus Lem. Ill. Hortic. 2: mise. 63. 1855, 
Typ Locauiry: Central Mexico. 
Distrisution: Mexico, 
Iutusrration: Berger, Ann. Rep. Mo. Bot. Gard. 16: pl. 3. f. 1-4. 
EXPLANATION OF PLATE LXIX.—From a photograph taken by Dr. D. T, MacDougal. 
Lemaireocereus thurberi (Engelm. ). 
Cereus thurbert Engelm. Am. Journ. Sci. IT. 17: 234. 1854. 
Typr Locauity: Canyon near the mountain pass of Bachuachi. 
Disrripution: Sonora and Lower California. 
IuLusrratTion: Engelm. Cact. Mex. Bound. pl. 74. f. 14. 
Lemaireocereus treleasei Rose, sp. nov. Puate LXX. 
Plants 5 to 7 meters high, simple or with a few strict branches; ribs about 20; 
areoles closely set, each with a peculiar V-shaped depression just above it; spines 
rather short, yellowish; flowers pinkish, 4 to 5 cm. long, diurnal; bracts on ovary 
and flower tube bearing slender whitish bristles; fruit red, about 5 cm. in diameter, 
covered with clusters of deciduous spines; seeds black with a dull rugose surface and 
a large oblique basal hilum. 
Collected by J. N. Rose on the road between Mitla and Oaxaca, September 5, 
1906 (no. 11300, type). The species had previously been collected by Dr. William 
Trelease in this same region. 
Type U.S. National Herbarium no. 454090. 
This species has flowers and fruit much resembling those of Lemaireocereus stellatus, 
but it has a different habit, the stems have more ribs, and it has different areoles. 
Mr. C. H. Thompson, of the Missouri Botanical Garden, has called my attention to 
the fact that this V-shaped groove is not known to occur in any of our North Ameri- 
can species of Cereus, but is a character of several South American species. 
EXPLANATION OF PLATE LX X.—From a photograph taken by Dr. D. T. MacDougal. 
Lemaireocereus weberi (Coult. ). Pirate LAXMI, 
Cereus weberi Coult. Contr. Nat. Herb. 3: 410. 1896. 
Cereus candelabrum Weber; Schum. Gesamtb. Kakteen 106. 1899. 
Type Locautiry: A few miles south of Tehuac:in, Puebla, Mexico. 
DisrriputTion: Puebla, Mexico. 
ILLusrrations: Gesamtb. Kakteen loe. cit. /. 24; MacDougal, Bot. N. Am. Deserts 
pl. 21. 
EXPLANATION OF PLATE LX XI.—From a photograph taken by Dr. D, T. MacDougal. 
Near L. griseus belong: 
CEREUS CHENDE Gosselin, Bull. Mus. Hist. Nat. Paris 11: 506. 1903. 
CEREUS CHICHIPE Gosselin, Bull. Mus. Hist. Nat. Paris 11: 507. 1903. 
See Monatssch. Kakteenk. 18: 155. 1908. 
10. LOPHOCEREDUS gen. nov. 
Plants either simple or with a few branches, or much branched at base; ribs few, 
areoles on the lower part of stem very different from the upper ones; flowering 
areoles (in the wild state) developing long bristle-like hairs standing out at right 
angles to the axis of the stem; flowers several from each areole, small (4 cm. or less 
long), funnelform with a narrow short tube; petals red; stamens short, included; 
fruit small, red, globular, less than 2 cm. in diameter, glabrous or with a few spines 
in the axils of small bracts; seeds numerous, small, black, shining, with a basal 
depressed hilum. 
Type species Cereus schottii Kngelm. 
