The Cactaceae : descriptions and illustrations of plants of the cactus family . many yearshas been an enthusiastic student of plants. Key to Species. Areoles on ovary and flower-tube bearing long bristles. Stems puberulent 1. W. viperina Stems glabrous. Corolla about 5 em. long; tube indefinite; seeds dull; spine-clusters approximate, 3 to 5 mm. apart. 2. W. poselgeri Corolla 10 to 12 cm. long; tube definite; seeds shining; spine-clusters distant, 7 to 15 mm. apart. .3. W. striata Areoles on ovary and lower part of flower-tube without long bristles 4. W. papulosa 1. Wilcoxia viperina (Weber) B
The Cactaceae : descriptions and illustrations of plants of the cactus family . many yearshas been an enthusiastic student of plants. Key to Species. Areoles on ovary and flower-tube bearing long bristles. Stems puberulent 1. W. viperina Stems glabrous. Corolla about 5 em. long; tube indefinite; seeds dull; spine-clusters approximate, 3 to 5 mm. apart. 2. W. poselgeri Corolla 10 to 12 cm. long; tube definite; seeds shining; spine-clusters distant, 7 to 15 mm. apart. .3. W. striata Areoles on ovary and lower part of flower-tube without long bristles 4. W. papulosa 1. Wilcoxia viperina (Weber) Brittonand Rose, Contr. U. S. Nat. : 242. 1913. Cereus viperinus Weber in Gosselin, Hist. Nat. Paris 10: 385. 1904. Stems elongated, branching, thelargest ones seen 1 cm. in diameter andbecoming spineless; branches denselyvelvety-puberulent, 8 mm. in diameteror less; ribs about 8, inconspicuous;spines about 8, appressed, dark, about5 mm. long; flowers red, about 3 ; spines of ovary and corolla-tubeblack, bristle-like, intermixed with longwhite Fig. 163.—Sections of stem of W. viperina. X Type locality: Zapotitlan, Mexico. Distribution: Southern Puebla,Mexico. The type of this species was col-lected by L- Diguet and is now in the
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Keywords: ., bookauthorbrittonn, bookcentury1900, bookdecade1910, bookyear1919
