Corryocactus brevistylus Schumann

Cereus brevistylus Schumann in Vaupel, Bot. Jahrb. Engler 50: Beibl. 111: 17. 1913.

Plants 2 to 3 meters high, usually much branched from the base, often forming large clumps, light green to almost yellow; ribs few, 6 or 7, very prominent; areoles 3 cm. apart, large, circular and elevated, with short, dense wool and spines; spines about 15, at first brownish, very unequal, some

BRITTON AND ROSE, VOL. II

PLATE X

less than 1 cm. long, some about 3 cm. long, and still others 20 to 24 cm. long; flower broadly funnelform, constricted just above the ovary, 9 cm. long, 10 cm. broad when fully expanded; throat 4.5 cm. broad at the top; perianth-segments bright yellow, oblong, spreading; filaments numerous, yellow; style short, thick, white, with numerous, slender, white stigma-lobes; scales of the ovary and flower-tube small, with brown wool, white bristles, and short spines; fruit globular, juicy, covered with numerous spine-clusters, these tardily deciduous.

Type locality: Yura, near Arequipa, Peru.

Distribution: In the mountains of southern Peru, altitude 2,000 to 3,300 meters.

This species is one of the three or four common cacti found on the hills and in the valleys both above and below Arequipa, and, while not the largest, is often the most abundant and conspicuous. Dr. Rose studied this plant in Peru in 1914, collecting living and herbarium specimens, including the very long spines described above (Nos. 18780, 18965).

Figure 99 is from a photograph taken near Arequipa, Peru, by T. A. Corry in 1917; figure 101 represents a flower collected by Dr. Rose near the same place in 1914.

Fig. 99.—Corryocactus brevistylus. Fig. 100.—Corryocactus brachy-

petalus

Fig. 99.—Corryocactus brevistylus. Fig. 100.—Corryocactus brachy-

petalus

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