260 BOTANY. 



Pin us edulis, Engelm. in Wisliz. Mem. note 2. — Similar to the last, 

 but with more slender, entire leaves, mostly in pairs, rarely in threes ; stami- 

 nate flowers surrounded by a 4-leaved involucre ; anthers with a knob or 

 short spur ; cones and seeds similar to those of the last species, only a little 

 smaller; cones usually but 1J' long; cotyledons as in previous species. 



Camp Bowie, Arizona, Rothrock (493). Common from Southern 

 Colorado through New Mexico to Arizona. The two species here described, 

 together with the slender and 3-leaved P. cembroides, with harder shells to 

 the larger seeds, and 8-12 cotyledons, and the little-known 4-5-leaved 

 P. Parryana of the northern part of Lower California, constitute a small 

 group of very peculiar Pines, which we may designate as the Cembroid 

 Pines, characterized by the leaves of the flexilis group (with entire margins, 

 peripheral ducts, and deciduous sheaths), by the seeds of Cembra and by 

 the cones and scales of Pinaster. Perhaps it would be proper not to lay 

 too much stress on the number of leaves and minor characters, nor on 

 their geographical difference, and to unite them under the oldest and most 

 appropriate name of P. cembroides, Zucc, though systematists, counting 

 the leaves, have separated them widely in their books. 



There is no pine entirely analogous to them in the Old World, unless 

 we should refer here the little-known P. Bungeana, Zucc; Murr. Conif. 

 Jap. 18, of Northern China. It has similar, small, subglobose cones, 

 though with less prominent knobs, but armed with recurved prickles ; the 

 seeds are smaller, with a very distinct wing, the leaves in threes lose their 

 sheaths as our Nut-pines do, but are serrulate, and have several peripheral 

 ducts, but, singularly enough, also usually a single interior or paren- 

 chymatous one, forming thus a link between several groups. 



Pinus Aeizonica, n. sp.— A middle-sized tree, 40° high, 2-3° in diam- 

 eter; branches squarrose, with persistent bracts; leaves in fives, 5-7' 

 l on g"> £" wide, closely serrulate, in a sheath over l'.long (when old less 

 than half as long) ; oval cone 2f long, \% thick ; scales with a prominent 

 knob, which in the lower ones is recurved, armed with a recurved prickle. 



On the Santa Rita Mountains, in Southern Arizona, Rothrock (652), 

 in 1874. "The best lumber of that region, there called yellow pine." 

 This seems to be a meagre account to found a new species upon in a genus 



