Corryocactus brachypetalus Vaupel

Cereus brachypetalus Vaupel, Bot. Jahrb. Engler 50: Beibl. 111: 16. 1913.

Plant 2 to 4 meters high, usually with many (sometimes 100 or more) strict branches from the base, forming a top 3 to 4 meters in diameter; ribs usually 7 or 8, somewhat prominent; areoles usually 2 cm. apart, large, 1 cm. in diameter or less, with short wool and spines; spines at first black with brown bases, about 20 at an areole, very unequal, most of them less than 1 cm. long, the longest ones 10 to 16 cm. long; flowers broadly funnelform, 4 to 6 cm. broad; throat 2 to 3 cm. broad at top; inner perianth-segments deep orange, 1 to 1.5 cm. long, the outer ones apiculate, the inner ones obtuse or truncate; filaments very short, 5 to 8 mm. long, yellow; style, including the slender stigma-lobes, 2 cm. long; areoles of the ovary and flower small, filled with black and white wool and nascent spines; fruit globular, 6 to 7 cm. in diameter, greenish yellow, covered with clusters of deciduous spines, juicy, said to be edible; seeds dull in color, 1 . mm. long.

Type locality: Rocky sandy bottoms near Mollendo, southern Peru.

Distribution: Foothills of southern Peru, altitude 600 meters.

This plant is very abundant in the foothills of southern Peru. In many places it is the only conspicuous plant in this arid region, which in the dry season is otherwise almost devoid of plant life. In the shelter of these plants thousands of lizards live and, doubtless, feed upon the flowers. Dr. Rose collected the species in 1914 (No. 18810) at Posco, Peru, not far from the type locality.

Fig. 101.—Flower of C. brevistylus. X0.7.

Fig. 103.—Fruit of Corryocactus brachypetalus. X0.7.

Figure 102 represents a flower and figure 103 a fruit, collected by Dr. Rose at Posco, Peru, in 1914; figure 100 is from a photograph taken near Posco, Peru, by T. A. Corry in 1918.

3. Corryocactus melanotrichus (Schumann).

Cereus melanotrichus Schumann, Gesamtb. Kakteen 71. 1897.*

Plant 1 to 2 meters high, forming small clumps with erect slender branches 3 to 4 cm. in diameter; ribs 7 or 8, much lower than in the other species; areoles 1 to 1.5 cm. apart, black or nearly so; spines 7 to 15, light yellow, subulate, somewhat unequal, the longest ones 5 to 7 cm. long; flowers broadly funnelform, 6 to 8 cm. long, 5 to 7 cm. broad; perianth-segments yellow; filaments much longer than in the other species; areoles of the flower with 1 to 5 long, black, bristle-like spines; fruit globular, 5 to 6 cm. in diameter, very juicy, covered with clusters of small acicular spines.

Type locality: Near La Paz, Bolivia.

Distribution: Central Bolivia, altitude 3,300 meters.

Plants of this species are much smaller than those of the other two and often form low thickets, growing on the barren hills in and about La Paz. The species was re-collected by Dr. Rose in 1914 (No. 18843).

9. PACHYCEREUS (Berger) Britton and Rose, Contr. U. S. Nat. Herb. 12: 420. 1909.

Usually very large plants, more or less branched, with definite trunks, the stems and branches stout, columnar, ribbed; flowers diurnal, with rather short tubes; outer perianth-segments short, spatulate; stamens included, numerous, inserted along the throat; style included; ovary and flower-tube covered with small scales bearing felt and bristles in their axils; fruit large, bur-like, dry, usually densely covered with clusters of deciduous spines and bristles; seeds large and black.

Type species: Cereus pringlei S. Watson

We recognize 10 species, all natives of Mexico, from northern Sonora to Yucatan. The name was first used by Berger as a subgenus of Cereus (Rep. Mo. Bot. Gard. 16: 63. 1905); we agree with his limitation of the group, except by excluding Cereus thurberi Engelmann,

*This name occurred in print two years earlier, but without description, in the Memoirs Torrey Botanical Club (4: 207).

referred by us to Lemaireocereus, and by including Cereus marginatus De Candolle, placed by him in his subgenus Stenocereus.

The name Pachycereus is from the Greek and means thick-cereus, referring to the stout stems and branches.

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