Montana Field Guide

Large tree up to 20 meters tall. Twigs olive to yellow-brown, brittle, easily breaking at base. Branchlets spreading, green to reddish brown, eventually glabrous. Petioles 0.5-1.5 cm long, glandular-viscid at the summit, the glands often stipitate. Leaves mostly 7-13 cm long, 1.5-3 cm wide, narrowly lanceolate to lanceolate, acuminate and often asymmetric (falcate) at tip, coarsely serrate with 4-6 glandular teeth per cm of leaf, dark to yellowish-green and shiny above, pale to white-glacous below. Catkins appearing with leaves; pistillate catkins 3-6 cm long, bracts caducous, yellowish, pubescent, apically ciliate, stamens 2. Capsules 4-5.5 mm long, narrowly conic, glabrous subsessile or stipes to 1 mm long (adapted from: Larson, 1986, Flora of the Great Plains).

Ornamental shade tree; rarely escaping into wet areas.

POLLINATORS
The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap: Bombus vagans, Bombus bifarius, Bombus fervidus, Bombus frigidus, Bombus huntii, Bombus melanopygus, Bombus ternarius, Bombus terricola, Bombus sitkensis, Bombus occidentalis, Bombus pensylvanicus, Bombus bimaculatus, Bombus griseocollis, Bombus impatiens, and Bombus suckleyi (Plath 1934, Macior 1968, Heinrich 1976, Thorp et al. 1983, Colla and Dumesh 2010, Colla et al. 2011, Koch et al. 2012, Williams et al. 2014).

Useful Links:
Montana Invasive Species website
Montana Biological Weed Control Coordination Project
Montana Department of Agriculture - Noxious Weeds
Montana Weed Control Association
Montana Weed Control Association Contacts Webpage.
Montana Fish, Wildlife, and Parks - Noxious Weeds
Montana State University Integrated Pest Management Extension
Weed Publications at Montana State University Extension - MontGuides