Suculentas \ Cactaceae \ Opuntioideae \ Opuntia \ aciculata
Descripción original de la especie publicada en la revista Proceedings of the Biological Society of Washington. Vol 29 Año 1916
NEW SPECIES OF OPUNTIA. BY DAVID GRIFFITHS. Opuntia aciculata sp. nov. A low hemispherical shrub, 1 m. high, and 1 to 2 m. in spread of branch, erect or main arms ascending or even resting on edge, and the secondary erect from them; joints ovate to obovate, mostly pointed above and below, 15 by 20 cm., but the older joints on our plants only 12 by 17 cm., dark green with some bloom; leaves circular in section, subulate, cuspidate, 7 mm. long, gradually recurved as they age; areoles subcircular, varying from 4 to 6 mm. in diameter with the conspicuous brown wool 1 mm. or more above the surface of the joint, about 2^ cm. apart on sides of joints; spicules bright brown, conspicuous and formidable, 5 to 7 mm. long, and tips lic^hter colored, nearly uniformly scattered thronj?hout the areoles, the tips of the tufts measuring 10 to 12 mm. in spread ; spines very few, only an occasional one on an occasional areola, brown, sloping down, 1 to 2 cm. long; flowers yellow with greenish centre 9 cm. in diameter, filaments greenish tinged, style white, stigma dark green, subglobose, 8 to 10-parted; fruit pyriform, deep purplish-red all the way through, having a little bloom up to early maturity. The type is preserved under my inventory number 10,300, and was collected near Laredo, Texas, June 26, 1911. The description was drawn from cultivated plants grown at Chico, California, May 21, 1914. The distinguishing characters of the species are prominent, brown, abundant spicules, pointed joints, and remarkably few spines. It differs from Opuntia tardospina in being smaller in stature throughout, in being almost spineless even in age, and in having differently shaped joints.
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