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Family: Salicaceae
narrowleaf cottonwood
[Populus balsamifera var. angustifolia (James) S. Wats., more, Populus canadensis var. angustifolia (James) Wesmael, Populus fortissima A. Nels. & J.F. Macbr., Populus salicifolia Raf., Populus tweedyi Britt., Populus X sennii Boivin]
 L.R. Landrum 
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Plant: tree; to 20 m tall, not clonal; bark tan, furrowed; TWIGS orange-brown, turning ivory-white by the third year, glabrous; winter buds resinous, reddish-brown, glabrous
Leaves: 2-7(-10) cm long, predominantly lanceolate, but the first to emerge from the buds broader; margins minutely to finely crenate-serrate with 35-50 uniform teeth on each side, these with sinuses up to 1.5 mm deep
Inflorescence: CATKINS 3-8 cm long; bracts glabrous; pedicels (1-)2-3 mm long
Flowers: with shallow disks, these 1-3 mm wide in fruit; stamens 10-20
Fruit: CAPSULES 3-5 mm long, ovoid to broadly ovoid, 2-valved
Misc: Mt. streamsides; 1500-2300 m (5000-7500 ft); Apr-May (fr. Jun-Jul)
REFERENCES: Eckenwalder, James E. 1992. Salicaceae. Ariz.-Nev. Acad. Sci. 26(1)2.
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