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Tree to 20 m, the trunk soon deliquescent; lfls 3–5 or on rapidly growing shoots to 9, pinnate, lanceolate to ovate or oblong, coarsely and irregularly serrate or with a few shallow lobes; dioecious; fls apetalous, appearing with or before the lvs, the staminate in sessile, umbel-like fascicles, drooping on slender pedicels, the pistillate in drooping racemes; disk wanting; mericarps 3–4.5 cm; 2n=26. Moist, especially alluvial soil; N.H. to Fla., w. to the Pacific, and irregularly in Mex. and Guat. Var. negundo, the common e. Amer. var., has glabrous, often glaucous twigs. (Negundo n.; N. nuttallii) Var. interius (Britton) Sarg. (Negundo i.), with velutinous twigs and usually with tufts of hairs in the vein-axils beneath, is chiefly western, occasionally extending to Minn. and Mo. Var. texanum Pax, with similarly hairy twigs, rather densely puberulent frs, and short-acuminate lfls pubescent over the whole lower surface, occurs chiefly from the Ozarks to Tex., extending e. to s. Ind.
Trees to 20 m tall, dioecious. Bark yellowish brown or gray-brown. Branchlets glabrous, those of present year green, older ones yellowish brown; winter buds small, scales 2(or 3) pairs. Leaves deciduous; leaf blade 10-25 cm, papery, pinnate; petiolules 5-7 cm, pubescent, glabrescent; leaflets 3-7(-9) per petiole; leaflet blades ovate or elliptic-lanceolate, 8-10 × 2-4 cm, base rounded or truncate, margin entire or with 3-5 teeth, apex acute. Pistillate inflorescence pendulous, racemose or compound racemose, axillary from leafless buds, 15-50-flowered. Staminate inflorescence usually a cluster of 4 flowers. Flowers 4-merous. Petals and disk absent. Stamens purplish, 4-6. Ovary glabrous. Samaras brownish yellow; nutlets convex, glabrous; wing including nutlet 3-3.5 cm × 8-10 mm, wings spreading acutely or nearly erectly. Fl. Apr, fr. Sep. 2n = 26.
Dioecious tree to c. 17 m high, deciduous, very widespreading; trunk becoming stout and gnarled. Shoots glaucous, glabrous. Lvs compound; leaflets 3-5-(7); petioles to 12 cm long. Leaflets very variable in shape and size, petiolulate or sessile; terminal leaflet usually to 15 × 8 cm, ovate; lateral leaflets often lanceolate-ovate, remaining hairy on veins below and sometimes on midrib above, coarsely crenate-serrate, sometimes lobulate; apex acute to acuminate. Fls appearing before lvs. ♂ infl. corymbose; pedicels long, filamentous, hairy, pendulous, pinkish. Sepals and petals 0.5-1 mm long, hairy or nearly glabrous. Stamens prominently exserted; filaments very short; anthers 2-4 mm long. ♀ infl. a pendulous raceme; pedicels very slender. Samara wings c. 2.5 cm long, broad, ± incurved, diverging at an acute angle. Seed c. 1.5 cm long, narrow.
A deciduous tree. It grows 20 m high and spreads to 5 m across. The trunk is 75 cm across. The stem is short and well branched. The leaves divide like the fingers on a hand. They have 3-5 leaflets with deep indents. Often the central leaflet is itself divided into three. The leaves can be 20 cm long. The leaves are light green and turn yellow in autumn. The flowers are greenish yellow. Male and female flowers occur on separate plants. The flowers are on branched stalks which hang downwards. The seeds are in double seed containers with wings set back at an angle. The seed containers do not break open.
