. Selected western flora : Manitoba, Saskatchewan, Alberta . Botany; Botany; Botany. 32 SELECTED WESTERN FLORA 1. QUERCUS. Oak. Sterile flowers in slender naked catkins; stamens 3-12; calyx. 2-8-parted; fertile flowers not in catkins but sometimes clustered; ovary enclosed in a scaly cup-like involucre forming a fruit called an acorn. Trees with heavy durable wood, rough bark, and usually sinuate-pinnatifid leaves. 1. Q. macrocarpa, Miohx. Bur Oak. Leaves lyrately pinnatifid or deeply sinuate; cup deep, almost enclosing the nut, and furnished with a fringe of bristles around the edge. A valuab
. Selected western flora : Manitoba, Saskatchewan, Alberta . Botany; Botany; Botany. 32 SELECTED WESTERN FLORA 1. QUERCUS. Oak. Sterile flowers in slender naked catkins; stamens 3-12; calyx. 2-8-parted; fertile flowers not in catkins but sometimes clustered; ovary enclosed in a scaly cup-like involucre forming a fruit called an acorn. Trees with heavy durable wood, rough bark, and usually sinuate-pinnatifid leaves. 1. Q. macrocarpa, Miohx. Bur Oak. Leaves lyrately pinnatifid or deeply sinuate; cup deep, almost enclosing the nut, and furnished with a fringe of bristles around the edge. A valuable tree in moist climates, but in our range seldom reaching large size. Rich soil, Man. north to Lake Winnipegosis and into eastern Fig. 29. — Quercus ma- crocarpa. XXI. URTICACE.*; (Nettle Family). Herbs, trees, or shrubs, with alternate or opposite stipulate leaves (stipules often deciduous) and monoecious, dioecious, or (in the elm) perfect flowers; calyx free from the ovary; ovary 1 or 2-celled forming a 1-seeded fruit; stamens as many as the lobes of the calyx., 1. tJLMUS. Elm. Flowers perfect; calyx 4-9-cleft, bell-shaped; sta- mens 4-9, with slender filaments; ovary 1 or 2-celled with a single ovule in each cell; fruit winged all around. Trees with tough wood and rough scaly bark. 1. U. americlna, L. American White Elm. Buds and branchlets smooth; leaves obovate or oval, abruptly pointed, soft-pubescent beneath, and usually oblique at the base; flowers in close fascicles. A rough- barked tree, usually with long spreading branches, and often with drooping branchlets, much used for ornamental Fig. 30. — Ul- purposes. Rich moist soil, especially along rivers, Man. raaa ameri- and E. Sask. cana. 2. CELTIS. Hackbbrey. Flowers monceoious with sometimes a few perfect^ calyx 5 or 6- parted, persistent; stamens the same number as the calyx lobes; ovary 1-eelled with a single ovule; Stigmas 2, long, recurved; fruit a drupe. Trees with large pointed leaves, very oblique
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