Cereus weingartianus Hartmann in Dams, Monatsschr. Kakteenk. 14: 155. 1904.
Roots in clusters, tuberous, thick; stems becoming terete and woody below, the branches creeping or climbing among shrubs and trees, sometimes to the height of 8 to 10 meters; stems 4 to 7-ribbed, at first slender and weak, 1.5 to 2 cm. in diameter; areoles 1 to 1.5 cm. apart,
circular, small, at first filled with short, whitish wool (afterwards disappearing) and acicular spines at first brownish or yellowish brown but in age becoming gray; radial spines 10 to 12, spreading; central spines a little stouter than the radials, a little spreading, often as many as 6, bulbose at base, 1 to 1.5 cm. long; flowers small, about 4 cm. long; fruit about 2 cm. long, covered with clusters of small, deciduous spines.
Type locality: Haiti.
This species has heretofore been known only from the type material from "Haiti."
In 1913 Dr. Rose collected an abundance of both living and herbarium material near
Azua, Santo Domingo, and a little later received living specimens from Father M. Fuertes, of Barahona, Santo Domingo. Dr. Rose's material showed for the first time the peculiar root system of this species. With it also were old flowers and fruit, heretofore unknown. The species is rare about Azua, only two stations being found in the lower foothills north of the town (No. 3941). Dr. Paul Bartsch collected specimens in Haiti in 1917 (No. 221).
Illustration: Monatsschr. Kakteenk. 14: 155, as Cereus weingartianus.
Figure 112 shows part of a branch of a plant collected by Dr. Rose at Azua, Santo Domingo, in 1913.
2. Leptocereus leonii Britton and Rose, Torreya 12: 15. 1912.
Cereus leoni Vaupel, Monatsschr. Kakteenk. 22 66. 1912.
Plant up to 5 meters high, repeatedly branching, the rounded trunk 3 cm. in diameter at the base, the cortex scaly-roughened; ultimate branches about 1.5 cm. in diameter, slender, elongated, 6 to 8-ribbed; old areoles 1 to 1.5 cm. apart in vertical rows, bearing acicular spines; ribs crenate, with the areoles borne at the depressions; spines 6 to 12 at an areole, long, yellowish when young, gray when old, 2 to 9 cm. long; flower 3.5 cm. long, campanulate; inner perianth-segments pink, about 15, withering-persistent; tube of flower bearing scattered areoles each with 1 to 4 short spines or some of them spineless; fruit globose-ovoid, 2 cm. in diameter, with a few scattered spine-bearing areoles; seeds black.
Type locality: Sierra de Anafe, near Guayabal, Cuba.
Distribution: On limestone rocks, Sierra de Anafe and Sierra de Guane, western Cuba.
The wood is very hard; the flowers appear from August to November.
At the type locality this tree-like species inhabits a steep rocky slope and cliff, difficult of access, growing as a colony.
Figure 113 is from a photograph of the type plant, obtained by Brother Leon, of the Colegio de la Salle, Habana, in whose honor the species was named.
Plant prostrate, bright green, 7-ribbed, 1.5 to 2 cm. thick, the ribs scarcely crenate; areoles elevated, about 1 cm. apart; spines 15 to 20 at an areole, acicular, 1 to 2 cm. long, yellow when young, gray when old; ovary densely covered with yellow spines; perianth about 1.5 cm. long; fruit about 1.5 cm. in diameter.
On high, dry, exposed rocks, La Guira, north of Sumidero, Pinar del Rio, Cuba (Shafer, No. 13754, August 17, 1912).
Leptocereus prostratus is related to L. leoni, which differs in having an erect trunk, the ribs of the branches deeply crenate, the areoles depressed in the crenatures, and larger flowers and, fruit.
4. Leptocereus assurgens (C. Wright) Britton and Rose, Contr. U. S. Nat. Herb. 12:
Cereus assurgens C. Wright in Grisebach, Cat Pl. Cub 116. 1866.
Plant 2 to 3 meters high, not much branched, the ultimate joints 3 cm. in diameter or less; ribs 4; areoles 1 to 2.5 cm. apart; spines acicular, brown, 2 to 8 cm. long; flowers 4 to 5 cm. long; tube and ovary bearing scattered clusters of spines inner perianth segments short numerous spreading or even turned backward; stamens and style pale greenish white; fruit covered with clusters of short spines.
Type locality: Western Cuba
Distribution: On limestone, near northern coast of Habana Province, Cuba.
This species was long known only from the collections of Charles Wright, but has been rediscovered by collectors connected with the New York Botanical Garden.
The name Cereus pellucidus (Pfeiffer, Enum. Cact. 108. 1837) belongs to this species or to some other Cuban member of the genus; the published description is not sufficiently complete to enable us to identify the plant more accurately.
Illustration: Schumann, Gesamtb. Kakteen f. 33, as Cereus assurgens.
Plate viii, figure 4, shows a plant collected by Britton and Cowell at Cojimar, Cuba, in 1911, which flowered in the New York Botanical Garden in July 1915. Figure 114 is from a photograph obtained by Brother Leon at the same locality.
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