212 TRANS. OF THE ACAD. OP SCIENCE. 



involucrata, in infima ramulorum hornotinorum parte in spi- 

 cam compositam congesta; antherse connectivo apice in um- 

 bonera saepius emarginatum sen in cristam transversam vari- 

 am excurrente, locnlis longitudinaliter dehiscentibus distinctis. 

 Amenta feminea in ramulis hornotinis subterminalia singula 

 sen subvertieillata. Folia ex axillis perularura singnla-quina, 

 basi vaginis membranaceis polyphyllis inclusa, Integra seu- 

 mafgine et carina snperiore serrnlata; singula teretia, bina 

 supra plana seu demum concava, dorso convexa, plura supra 

 carinata, dorso plana sen convexa. 



6. Pinus, Lin. gen. eel. 1, Link. — Pine. 



Picea Engelmanni, Parry, sub Abiete, St. Louis Trans. 

 %p. 122 ; Abies nigra, Eng'el. in Sill. Jour. 33, p. 330, non 

 Poir. : arbor elatior, pyrarnidata ; cortice tenui squamato 

 rubello ; ramulis pubescentibus; ])ernlis ovatis obtusis squar- 

 rosis; foliis confertis robnstis compresso-tetragonis abrupte 

 acutiuscnlis plernraque enrvatis ; amentis ovato-cylindricis 

 perulis late ovatis involncratis, feminearnm bracteis scjuamas 

 ovatas obtnsas crenulatas sqnarrosas longitndine snba?qnanti- 

 bus; strobilis ovato-cylindrieis obtusis terniinalibus laterali- 

 busve cum ramulis suis borizontalibus seu declinatis, squamis 

 tenuibus obovato-rhombeis apice plus minus truncatis emargi- 

 natis crenulato-erosis ; seminum ala oblique obovata. 



Higher parts of the Rocky Mountains, from New Mexico 

 to the headwaters of the Columbia and Missouri Rivers, and 

 probably further; from the subalpine to the alpine districts, 

 and with Pinus aristata reaching the highest limits of tim- 

 ber; occupying in Colorado a belt between the limits of 

 8,000 and 1"2,000 feet, it reaches its fullest development be- 

 tween 9,000 and 10,000 feet, near the headwaters of the 

 streams on both slopes of the Snowy Range, constituting 

 magnificent forests about the head of Middle Park, at Tarry- 

 all, etc., often mixed with Abies grandis ; not found lower 

 down, e. g. at Fontaine-qui-bouit, where Picea Menziesii, 

 with Tsuga Douglasii, reign as monarchs of the forest. Fl. 

 end of June. 



In its most favorable localities this species makes a stalely 

 tree, 60-100 ft. high, forming a narrow, sharply-tapering spire, 

 of a rather darkish hue; trunk perfectly straight, colum- 

 nar, tapering very gradually, \\-l\ feet in diameter ; branches 

 mostly small, lower ones horizontal, upper ones ascending: 

 on higher altitudes it is a smaller, nearly round-topped tree, 

 very much branched, bearing more perfect ftuit than in either 

 lower or higher elevations; on the highest summits a prostrate 

 and almost creeping, sterile shrub, just as Picea nigra is found 

 on .Ml. Washington, N. II. Park 'only 1-1!, lines thick, scaly, 

 reddish, grayish-purple or light purplish-brown, containing 



