350 PROCEEDINGS OF THE AMERICAN ACADEMY 



or tree, in the vicinity of San Francisco growing 40-60 feet high and 

 2-4 feet in diameter, and ranging southward to Santa Barbara, South- 

 ern Arizona and Sonora. The more eastern J. rupestris, Engelm., is 

 but G-20 feet high, with more numerous and usually more acuminate 

 leaflets, the ameuts only two inches long with smaller flowers, 20-30 

 stamens, shorter anthers and a more prominent connective, the globose 

 nut 6-7 lines in diameter with very thick and nearly solid walls. 



Myrica Hartwegi. Dioecious ; leaves deciduous, oblanceolate, 

 acute, attenuate to a short petiole, 2 inches long, serrate above, pubes- 

 cent, especially on the margin, as also the branchlets: staminate spikes 

 solitary, cylindrical, 5-8 lines long, many-flowered; bracts glabrous, 

 brown, imbricated, broadly ovate, acute ; stamens 3-4, shorter than the 

 bracts, the filaments united at base; female flowers and fruit unknown. 

 {M. Gale, Benth. in PL -Hartweg.) — Collected by Hartweg (n. 1958) 

 on the Sacramento, by Fremont, and on the south fork of the Merced 

 near Clark's Station by Mr. Muir, who describes it as a small bush six 

 feet high. It difl^ers from M. Gale (which is not known from south 

 of Alaska on the Pacific Coast) in its larger, thinner, acute and more 

 coarsely toothed leaves, the male aments rather longer and less 

 crowded. 



POPULUS Freiiontii. Leaves puberulent, especially upon the 

 margin, subreniform, abruptly acute, rather deeply sinuate-dentate, the 

 many incurved teeth scarcely glandular-tipped ; petioles slender, equal- 

 ling the blade, somewhat flattened above; male aments stout, 4—5 

 inches long, loose, with slender pedicels 8-10 lines long, and naked 

 laciniately fringed bracts, the toi-us thick and conspicuous, 3-4 lines 

 broad ; stamens 60 or more ; fruiting aments 4 inches long, with pedi- 

 cels 2 lines long, the three stigmas broadly dilated and irregularly 

 lobed ; fruit ovate, 3-4 lines long, as broad as the torus, with three 

 very thick finely tuberculate valves, the sutures not prominent. — Col- 

 lected by Fremont (n. 243, 244 of 1846) on Deer Creek at "Lassens" 

 in the Upper Sacramento Valley. The young branches are light 

 gray, slightly pubescent, not angled. Distinguished especially by the 

 remarkably developed torus. 



