SALICACEAE, — POPULUS 31 
? Populus Jacq tiana Dode in Mém. Soc. Hist. Nat. Autun, XVIII. 
(Extr. Monog. Inéd. Populus, 66, t. 12, fig. 108) (1905). 
INDIA. Bhutan. 
Through the kindness of the Keeper of the Herbarium of the Royal Gardens, Kew 
three sheets of Haines’ plant bearing the No. 826 have been loaned to the Arnold 
Arboretum: one with fruits, collected June 1904, Labah ridge, alt. 2200 m.; an- 
other with leaves, collected August 1904, Bhotan, without precise locality, alt. 
2400 m.; and the third with flowers only, collected April 1905, Pankasari ridge, 
alt. 2700 m. In their shape and in the color of the upper surface the leaves resemble 
those of P. Wilsonii Schneider, and are up to 20 cm. long and 18.5 em. broad, the 
petioles being up to 13.5 em. long. The color of the under surface of the leaves is 
glaucous, not whitish as in the dried leaves of P. Wilsonii, but the scarce pubescence 
is almost the same in both, while in P. lasiocarpa Oliver even the mature leaves of 
cultivated plants are hairy along the midrib and the main veins beneath. The 
flowers of P. glauca are mostly bi-sexual, as indicated by Haines, otherwise the 
perianth and the ovaries scarcely differ from those of P. Wilsonii, the perianth 
of which is mostly not so largely developed and so deeply lobed as in P. glauca. 
In this species the stigmas seem to be a little shorter-stalked, but as far as I can 
judge from the material before me all these characters of the flowers are too vari- 
able to represent good distinguishing features. The fruits of P. glauca are roundish 
and apparently a little more pubescent or villose than those of P. Wilsonit. Both 
species need further study. 
5. Populus lasiocarpa Oliver. See p. 17. 
Sect. 3. TACAMAHACA Spach, Hist. Vég. X. 392 (1841). 
Populus, subgen. Eupopulus Dode, sect. Tacamahacae Dode in Mém. Soc. 
Hist. Nat. Autun, XVIII (Eztr. Monog. Inéd. Populus, 14 et 34) (1905). 
Folia ramulorum turionumque inter se pleraque variabilia, subtus distincte dis- 
coloria, albescentia, superne stomatibus plus minusve numerosis! v. nullis praedita, 
basi glandulifera; petioli longitudine variabiles. Disci florum persistentes, margine 
lobati v. crenati; stigmata 2-4, stylis brevibus v. nullis; stamina 18-60, antheris 
oblongis v. subglobosis, haud apiculatis. Capsulae variabiles. 
6. Populus ciliata Wallich apud Royle, IUl. Bot. Himal. 1. 346; 11. t. 84* or 98, 
fig. 1 (1839). — Wesmael in De Candolle, Prodr. XVI. 2, 329 (1868); in Mém. Soc. 
Sci. Hainaut, III. 63 (Monog. Populus) (1869). — Brandis, Forest Fl. Brit. Ind. 
475 (pro parte) (1874); Ind. Trees, 640 (pro parte) (1906). — Stewart, Punjab Pl. 
204 (1869). — Hooker f., Fl. Brit. Ind. V. 638 (1888). — Collett, Fl. Siml. 481 
(1902). — Dode in Mém. Soc. Nat. Hist. Autun, XVIII. (Eztr. Monog. Inéd. 
Populus, 65) (1905). — Haines in Jour. Linn. Soc. XXXVII. 407 (1906). — Gom- 
boez in Math. Termesz. Kózl. XXX. 116 (Monog. Gen. Populi) (1908). — Henry 
in Elwes & Henry, Trees Gr. Brit. & Irel. VII. 1840, in adnot. (1913). 
INDIA. Western Himalaya to Bhutan: Kumaon, northern face of Choor, 
R. Blinkworth (No. 2796 of Wallich’s Cat., type; with ripe fruits); Srinaghur, Kam- 
rup (No. 2796 B of Wallich's Cat.); Nain-tál, alt. 2100 m. Strachey & Winterbottom 
(No. 1); northwest Himalaya, without locality (Lachen?), 2000-3000 m., T. 
Thomson; Sikkim, without locality, 2-3000 m., J. D. Hooker; Chakrata, alt. 2300 
m., June 26, 1912, K. Narayana Jyengar (a lofty tree with gray, smooth bark; 
common in blanks in Deodar forests); same locality, May 5 and June 25, 1912, 
! According to Gombocz the plants of this section have no stomata on the upper 
surface of the leaves. 
