220 THE CACTACEAE. 



Illustrations: Pfeiffer and Otto, Abbild. Beschr. Cact. i:pl. 12; Kngler and Prantl, 

 Pflanzenfam. 3 6a :f. 58, both as Cereus flagrijormis. 



Figure 298 is copied from the first illustration above cited. 

 4. Aporocactus conzattii sp. nov. 



Creeping, clambering, or hanging from a support, developing aerial roots here and there ; stems 

 12 to 25 mm. in diameter; ribs 8 to 10, rather prominent, low-tuberculate ; aeroles 3 to 4 mm. apart; 

 spines 15 to 20, acicular, light brown, unequal, the longest 12 mm. long; buds nearly erect, covered 

 with brown acicular spines or bristles; flowers 8 to 9 cm. long; tube nearly straight, red, bearing a 

 few ovate scales, their axils short-woolly and with a few bristle-like spines; limb slightly oblique, 

 with a wide mouth; upper inner perianth-segments arching forward, the lower ones somewhat re- 

 flexed, all narrow, 6 to 7 mm. broad, acute, brick-red; stamens and style shorter than the perianth- 

 segments but exserted from the throat of the flower, long, connivent, nearly white; style slender, 

 stiff, white, nearly 6 cm. long, not extending beyond the filaments; tube proper 2 to 2.5 cm. long; 

 throat about 1 cm. long, narrow, bearing stamens all over its surface; filaments numerous, white; 

 flower open for 2 days, remaining open at night. 



Fig. 299. — Aporocactus conzattii. Xo.66. 



Collected by Professor C. Conzatti in 1912 on Cerro San Felipe, Oaxaca, Mexico, and 

 flowered in Washington, first on February 17, 191 6, and again in 19 17. 



This species is near Aporocactus martianus, but the inner perianth-segments are not long- 

 acuminate, and the flowers are smaller (at least than those shown in Hooker's illustration). 

 It is a very valuable introduction for greenhouse culture. 



Figure 299 is from a photograph of the type plant which flowered in Washington, in 

 19 18; figure 300 shows a flower of the same. 



5. Aporocactus martianus (Zuccarini). 



Cereus martianus Zuccarini, Flora 15 2 : Beibl. 66. 1832. 



Eriocereus martianus Riccobono, Boll. R. Ort. Bot. Palermo 8: 240. 1909. 



Stems rather stout, somewhat branched, 15 to 18 mm. in diameter; ribs about 8, low, obtuse; 

 areoles 12 mm. apart; spines 6 to 8, acicular to bristle-like; flowers a deep rose-color, 8 to 10 cm. 

 long; outer perianth-segments narrowly lanceolate, acuminate; inner perianth-segments similar but 

 long-acuminate; style long exserted; fruit globular, 2 cm. in diameter, greenish, spiny. 



