The Cactaceae : descriptions and illustrations of plants of the cactus family . Fig. 15.—Cereus obtusus. Fig. 16.—Cereus aethiops. 20. Cereus chalybaeus Otto in Forster, Handb. Cact. 382. 1846. Piptanthocereus chalybaeus Riccobono, Boll. R. Ort. Bot. Palermo 8: 227. 1909. Stems 2 to 3 meters high, with few ascending branches; ribs 6, very high on the young partsof the stems and there separated by wide intervals, more or less purplish; radial spines usually 7,but on old stems much more numerous; central spines several, a little longer than the radials, alldark brown; perianth large, about 2 dm.
The Cactaceae : descriptions and illustrations of plants of the cactus family . Fig. 15.—Cereus obtusus. Fig. 16.—Cereus aethiops. 20. Cereus chalybaeus Otto in Forster, Handb. Cact. 382. 1846. Piptanthocereus chalybaeus Riccobono, Boll. R. Ort. Bot. Palermo 8: 227. 1909. Stems 2 to 3 meters high, with few ascending branches; ribs 6, very high on the young partsof the stems and there separated by wide intervals, more or less purplish; radial spines usually 7,but on old stems much more numerous; central spines several, a little longer than the radials, alldark brown; perianth large, about 2 dm. long and about as broad when fully expanded; flower-tubeabout 1 dm. long, purplish, bearing long tubercles crowned by minute scales; outer perianth-segments pinkish, narrowly oblong, the inner white, acute, sometimes toothed; filaments numerous,long-exserted beyond the throat, but shorter than the perianth-segments; style elongated, muchlonger than the filaments, weak; stigma-lobes many; fruit spherical, smooth, yellow. Type locality: Not : Northern Ar
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Keywords: ., bookauthorbrittonn, bookcentury1900, bookdecade1910, bookyear1919
