

IvEMAIREOCRRUUS. 



97 



type locality (No. 11133). 



Mexico 



Acclim 



Smiths 



52: 18. f. 2, as 



Queretaro, Mexico 



stem-arcolcs of an herbarium 



KiG. 



Fig. 

 Fig. 



140 

 141. 



142 



Cluster of spines of Leraaireocereus weberi. X0.7. 



Fruit of same. X0.7. 



Part of rib, showing spine-clusters of Lemaireocereus qucrctaroensis 



X0.7 



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16. Lemaireocereus montanus sp. nov. 



Tree-like, 6 to 7 meters high, with a definite smooth trunk i meter long or more, with few 

 branches, at first spreading, then nearly erect; ribs few, usually 8, prominent areoles r to 1.5 cm. 

 apart, large, filled with short brown wool; spines few, 6 or less, pale in color, rather stout, one of them 

 longer, sometimes 3 cm. long; flowers 6 to 7 cm. long, opening during the day; outer perianth-seg- 

 ments purplish; scales on the ovary ovate, 4 to 6 mm. long, imbricated, acuminate, with erose margins. 



This species was found well up on the side of Alamos Mountain, associated with 

 Lemaireocereus thurberi, but usually at a higher altitude than that at which that species is 

 generally found. It differs from L. ihurberi in its habit, number of ribs, armament, and 

 flowers. I^ike L. ihurberi it has brown areoles, which are not found in any of the other 

 species except L. queretaroensis of the table-land region of central Mexico. 



Collected by Rose, Standley, and Russell above Alamos, Mexico, March i8, 1910 



(No. 13039). 



17. 



i 



Lemaireocereus thurberi (Engelmann) Britton and Rose, Contr. U. S. Nat. Herb. 12 : 426 



1909 



Ceretis thurberi Engelmann, Amer. Journ. Sci. II. 17: 234. 

 Pilocereus Ihurberi Riimpler in Forstcr, Handb. Cact. cd. 2. 

 Cereus thurberi littoral is K. Brandcgee, Zoe 5: 191. 1904. 



1854 

 689. 



1885 



r 



Usually without a definite trunk, sending up from the base 5 to 20, or even more, erect or ascend- 

 ing branches 3 to 7 meters high, 15 to 20 cm. in diameter, the basal ones usually simple but occasion- 

 ally with lateral branches, this doubtless being caused by injuries to the growing tips; ribs numerous, 

 12 to 17, rather low but sometimes 2 cm. high, rounded, separated by narrow intervals ; areoles 10 

 to 15 or rarely 30 mm. apart, large, sometimes becoming i cm. in diameter, circular, brown-fcltcd, 

 more or less glandular, the whole areole becoming a wax-like mass; spines numerous, acicular to 

 subulate, unequal, brownish to black, becoming gray in age, the longest ones sometimes 5 cm. 

 long; flowers mostly borne near the top of the stem but sometimes 3 dm. below the top, 6 to 7.5 

 cm. long including the ovary, opening during the day; outer perianth-segments broad, reddish, im- 

 bricated, gradually passing into the scales on the tube; inner perianth-segments light purple with 



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