. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. MAMMILLARIA MANDEVILLA 977 01. bicolor, Lehni. Simple or proliferous: tubercles small, crowded, ovate-pyramidal : radial spines 16-20; centrals 2, less than 1 in. long, stouter, erect, black- tipped. Mes. Var. nivea, Sebum. Obovate proliferous tubercles conical: radial spines capillary; centrals 4, white, with
. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. MAMMILLARIA MANDEVILLA 977 01. bicolor, Lehni. Simple or proliferous: tubercles small, crowded, ovate-pyramidal : radial spines 16-20; centrals 2, less than 1 in. long, stouter, erect, black- tipped. Mes. Var. nivea, Sebum. Obovate proliferous tubercles conical: radial spines capillary; centrals 4, white, with dusky apex, upper one incurved, 1 in. long. C2. Parkinsonii, Ehrh. At length dichotomously di- vided: tubercles slenderly pyramidal; axils woolly and bristly: radial spines 20 or more, slender; centrals 2, 3, 4, rarely 5. brown-tipped, the upper ones 3—4 lines long, the lower 1% in. turned downward. Mex. 63. formdsa, Sclieidw. Nearly simple: tubercles 4-an- gled: radial spines 18-22, rather rigid; centrals 6, a little longer, stiffer, thickened at base, reddish or brownish tipped. 64. anguliris, Link & Otto (M. snbangjildris, DC). Densely cespitose: axils of the young tubercles setose as well as woolly: radial spines 3-7, the upper ones often very short, the lower one sometimes 3 in. long, occasionally a very long central present. Blex. 65. centricirrha, Lem. {M. ariefina and deflexispUm, Lem. M. I^orsteri (lmeri, MUhlpf. M. Schmidtii, Soke. M. tetrardntha, Hort.). Copiously proliferous: tubercles pyramidal, 4-angular: spines irregular, mostly 4-6 radials and 1 central, sometimes only 1, sometimes 2 centrals with 1-2 very short radials or none; radials very stout, straight or curved, awl-shaped, reaching % in.; central stouter, sometimes nearly 2 in. long; young spines yellow. Mex. 66. mutabilis, Scheidw. (M. anfiimnAlis, Dietr. If. cirrhifem, Mart.). At length sparingly cespetose, de- pressed-globose or short-cylindric: tubercles pyramidal, 4-angled: axils with sto
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