Sometimes only 1 to 2 meters high and much branched at base, or sometimes tall, 5 to 7 meters high and branched above, with a large woody trunk; branches 8 to 10 cm. in diameter, ascending or slightly spreading, bluish green when young, grayish green in age; ribs 7 to 9, obtuse; spines brown when young; radial spines several, 1.5 cm. long or less; central spines often solitary, porrect, 2 to 3 cm. long; flowering areoles bearing long white wool; flowers 7 cm. long; inner perianth-segments short, oblong, obtuse; scales and outer perianth-segments obtuse, purplish; fruit nearly globular, about 4 cm. in diameter, reticulated.
The species is based on two collections from widely separated localities in Ecuador, one being from the Pacific coast near sea-level, and the other from east of the coast range at an altitude of about 3,000 feet. The first was collected by J. N. Rose and George Rose in thickets near Santa Rosa, Province Del Oro, October 15, 1918 (No. 23494, type), and the other east of Ayapamba, same province, October 15, 1918 (No. 23454). This is the first species of Cephalocereus reported from Ecuador and is the most southern species known on the west coast of South America. It is dedicated to Mr. Andrew Mellick Tweedy, who assisted Dr. Rose in his Ecuadorean Expedition in 1918.
Figure 78 shows the type plant as it grows in thickets along the coast at Santa Rosa; figure 79 shows it as it grows in the open below Ayapamba, both from photographs by George Rose; figure 80 shows a flower and figure 81 a fruit collected by Dr. Rose near Ayapamba, Ecuador, in 1918.
42. Cephalocereus alensis (Weber) Britton and Rose, Contr. U.
Pilocereus alensis Weber in Gosselin, Bull. Mus. Hist. Nat. Paris 11: s08. 190s.
Cereus alensis Vaupel, Monatsschr. Kakteenk. 23: 23. 1913. Fig 80.—Flower°f C tweedyanus. Xa5.
Erect, sometimes 5 to 6 meters high, branching from the base; branches rather slender, spreading, 12 to 14-ribbed, the ribs somewhat tuberculate; spines 10 to 14, acicular, about 1 to 1.5 cm. long, brownish; flowering areoles on one side of the stem, developing white or yellowish hairs 5 cm. long; flowers light purple to purplish green; perianth-segments fleshy, usually rounded at apex; ovary nearly naked; fruit not known.
Type locality: Sierra del Alo, Mexico.
Distribution: Western Mexico.
The type of the species was collected by Léon Diguet and is preserved in the Museum of Paris, where it was studied by Dr. Rose in 1912. To this species we would refer specimens collected in Jalisco, Mexico, in 1892, by M. E. Jones.
Illustration: Bull. Soc. Ac-lim. France 52: f. 16, as Pilocereus alensis.
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