File:The Cactaceae - descriptions and illustrations of plants of the cactus family (1919) (14596623479).jpg

Identifier: cactaceaedescri02brit (find matches)
Title: The Cactaceae : descriptions and illustrations of plants of the cactus family
Year: 1919 (1910s)
Authors: Britton, Nathaniel Lord, 1859-1934 Rose, J. N. (Joseph Nelson), 1862-1928
Subjects:
Publisher: Washington : Carnegie Institution of Washington
Contributing Library: The LuEsther T Mertz Library, the New York Botanical Garden
Digitizing Sponsor: The LuEsther T Mertz Library, the New York Botanical Garden

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orus Linnaeus. The name is from the Greek and signifies moon-cereus, the plants being night-blooming. All the species are clambering vines with aerial roots, and in the tropics often reach thetops of high trees; where there are no trees or shrubs, they trail over rocks and walls. Mostof them have very large flowers; in fact, one of the largest flowered species of the family (S.macdonaldiae) belongs here. Several of the species, such as 5. hamatus, S. grandiflorus,S. macdonaldiae, and 5. pteranthus (better known as Cereus nycticalus), have long beenfavorites with amateurs. In our studies of the genus we have had several hundred growingplants under observation, representing all the species, and specimens of all have bloomed.The species of the genus range from southern Texas through eastern Mexico, CentralAmerica, the West Indies and along the northern coast of South America, while one specieshas been reported from Argentina. Sixteen species are here recognized. BRITTON AND ROSE, VOL. II
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M. E. Eaton del. 1. Fruit of Hylocereus undatus. 2. Flowering branch of Wilmattea minut,flora. 3. Longitudinal section of fruit of Selenicerens grandiflorus. ( All natural size.) SELENICEREUS. 197 Key To Species. Areoles of the ovary and flower-tube bearing long hairs.Branches ribbed, angled or subterete, not spurred. Areoles of the brandies borne on the ribs or angles.Spines of the branch-arcoles acicular. Hairs of flower-arcoles tawny or whitish 1. S. grandiflorus Hairs of flower-areoles bright white. Branches 4 or 5-angled; stem-areoles without bristly hairs. Spines brown 2. S. urbanianus Young spines yellow 3. S. coniflorus Branches 7 to 10-ribbcd; stem-areoles with many bristly hairs 4. S. hondurensis Spines of the branch-areoles short, conic. Branches 9 or 10-ribbed; branch-areoles with many appressed hairs 5. ,S\ donkelaartt Branches 4 to 6-ribbed; young branch-areoles with few long hairs. Stems stout, 3 to 5 cm. thick 6. 5. pteranlhus Stems slender, 1.5 to 3 cm. thick.Hairs of

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