. Carnegie Institution of Washington publication. 102 THE CACTACEAE. 21. Lemaireocereus dumortieri (Scheidweiler) Britton and Rose, Contr. U. S. Nat. Herb. 12: 425. diimorlicri SclK-idweiler, Hort. Beige 4: 220. 1837. Often tree like, 6 to 15 meters high, the trunk proper short, 6 to 10 dm. long, 3 dm. in diameter or more, woody; branches many, erect almost from the first, with numerous constrictions, very pale bluish green or somewhat glaucous; ribs generally 6, sometimes 5 or 7, occasionally 9 on very old joints; areoles elliptic, approximate or often confluent, gray-felted; spines various i
. Carnegie Institution of Washington publication. 102 THE CACTACEAE. 21. Lemaireocereus dumortieri (Scheidweiler) Britton and Rose, Contr. U. S. Nat. Herb. 12: 425. diimorlicri SclK-idweiler, Hort. Beige 4: 220. 1837. Often tree like, 6 to 15 meters high, the trunk proper short, 6 to 10 dm. long, 3 dm. in diameter or more, woody; branches many, erect almost from the first, with numerous constrictions, very pale bluish green or somewhat glaucous; ribs generally 6, sometimes 5 or 7, occasionally 9 on very old joints; areoles elliptic, approximate or often confluent, gray-felted; spines various in number and in length, 10 to 20 radials, i central or more, the longer ones often 4 cm. long, all at first straw- colored but in age blackened; flowers 5 cm. long, the tube and ovary bearing small ovate scales with bunches of felt and occasionally bristles in their axils, the limb about cm. broad; fruit oblong, small, 3 to 4 cm. long, reddish within, not spiny, its areoles nearly contiguous, felted; seeds brown- ish, mm. long, dull, roughened. 7~v/v locality: Incorrectly given as Buenos Aires (see note below). Distribution: Central Mexico. Our description is drawn from numerous specimens collected by Dr. Rose in central Mexico. This is the plant which passes as Ccrcns dumortieri in collections, but from the description alone one can hardly be certain. It ranges over a considerable territory, but is never abundant, being found generally as large iso- lated individuals on the sides of rocky hills and cliffs. Greenhouse plants much resemble Pachycereus marginatus, and both species have small flowers; but the wild plants are very unlike and the fruit and seeds differ widely. Although Scheidweiler in his original descrip- tion of this species referred it to "Buenos Ayres," he doubtless made a mistake, as he must have done in his reference of Mammillaria obconclla in the same publication. The original description does not correspond to any known South American cact
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