. Carnegie Institution of Washington publication. no THE CACTACEAE. This ]>l:uit was collected for Cereus nichiintnts, but it is too tall and stout and has spines and smaller (lowers. We have living specimens of this plant collected by Scfior Porto, but they have not yet flowered in cultivation. 16. WILCOXIA Britton and Rose, Contr. U. S. Nat. Herb. 12: 434. 1909. Plants usually low and weak, producing a cluster of dahlia-like roots; stems very slender, more or less branched, the branches often only the diameter of a lead pencil; ribs few and low; spines of all the areolcs similar; flowers
. Carnegie Institution of Washington publication. no THE CACTACEAE. This ]>l:uit was collected for Cereus nichiintnts, but it is too tall and stout and has spines and smaller (lowers. We have living specimens of this plant collected by Scfior Porto, but they have not yet flowered in cultivation. 16. WILCOXIA Britton and Rose, Contr. U. S. Nat. Herb. 12: 434. 1909. Plants usually low and weak, producing a cluster of dahlia-like roots; stems very slender, more or less branched, the branches often only the diameter of a lead pencil; ribs few and low; spines of all the areolcs similar; flowers diurnal, funnelform-campanulate, red or purple, large for the size of the plant, only i from an areole, the tube rather short,its areoles bearing spines or bristles and wool; arcoles of the ovary and fruit bearing spines or bristles and wool; seeds black; aril large, basal. Type species: Echinocereus poselgcri Lemaire. Four species, of Texas and Mexico, compose the genus as known. The type species has been included in Echinocereus, but its habit is very unlike that genus, while the second and third species have been considered as belonging to Ccrcns proper. The genus was named for General Timothy E- Wilcox, U. S. A., who for many years has been an enthusiastic student of plants. KEY TO SPECIES. Areolcs on ovary and flower-tube bearing long bristle*. Stems puberulent I. W. viperina Stems glabrous. Corolla about 5 cm. 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. slriata Areoles on ovary and lower part of flower-tube without long bristles 4. W. papillosa 1. Wilcoxia viperina (Weber) Britton and Rose, Contr. U. S. Nat. Herb. 16: 242. 1913. Cereus viperinus Weber in Gosselin, Bull. Mus. Hist. Nat. Paris 10: 385. 1904. Stems elongated, branching, the largest ones seen i cm. in diameter and becoming spineless; branches densely v
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