Opuntia burrageana sp nov

Usually low and bushy, rarely 1 meter high; stems slender, 1 to 2 cm. in diameter, densely spiny; leaves small, 2 mm. long, green, early deciduous; old stem and branches terete; young joints

Fig. 84.—Opuntia prolifera Fig. 85.—Opuntia alcahes.

cylindric to narrow- clavate, 15 cm. long or less; areoles closely set; tubercles rather low, not much broader than long; spines numerous, similar, spreading, rarely 2 cm. long, all covered with thin, bright-yellow sheaths; wool in areoles short, brown; glochids, when present, short, light yellow; flower 3 to 4 cm. broad; petals few, brownish red with green bases; filaments green; stigma-lobes white; ovary very spiny; fruit not proliferous, globular, 2 cm. in diameter, somewhat tuberculate, probably dry; seeds pale, 4 mm. in diameter.

Common on the hills along the coast of southern Lower California.

1. Plants of Opuntia fulgida.

2. A very open plant of Opuntia spinosior.

1. Plants of Opuntia fulgida.

2. A very open plant of Opuntia spinosior.

The following specimens were collected by Dr. J. N. Rose in 19 11: Near Pichilinque Island (No. 16533, type); near San José del Cabo (No. 16468); near Cape San Lucas (No. 16379); on Carmen Island (No. 16630); on San Josef Island (No. 16552).

Plate xiv, figure 1, is from a plant collected by Dr. Rose on San Josef Island, Lower California, in 1911, which flowered the next year at the New York Botanical Garden.

Series 8. VESTITAE.

The series Vestitae contains three or perhaps four species, two of which possibly represent greenhouse forms of species of Tephrocactus, natives of the high Andes. They are low species with elongated cylindric joints sometimes arising from subglobose ones, and form a connecting link between the true species of Tephrocactus and Cylindropuntia. Opuntia vestita in the field was supposed to be a form of O. pentlandii, but in cultivation it has developed quite differently: O. floccosa, a Tephrocactus, sometimes develops like the Vestitae; one specimen which we have grown shows a slender cylindric stem with few long hairs or none. Opuntia boliviana and O. pentlandii, both from Bolivia and described at the same time by Salm-Dyck, and which we have united, seem to represent two forms of the same species, O. pentlandii being the abnormal form. The same condition seems to exist in O. verschaffeltii and its variety digitalis, the variety being the normal form. Schumann had these species in his series Teretes (our series Subulatae), but O. subulata and O. cylindrica are tall woody, much branched plants.

Continue reading here: Key to Species

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