Great Ragweed
Great Ragweed, Ambrosia trifida, Sunflower Family (Asteraceae) Description: A tall, rough, hairy plant with nodding heads of minute green flowers arranged in elongated clusters. Flowers: similiar to those of Common Ragweed; clusters 1-10″ (2.5-25 cm) long. Leaves: up to 8″ (20 cm) long, opposite, palmately 3-lobed. Fruit: beaked, with 4-10 short points. Height: 2-15′ (60-450 [...]
Jack-in-the Pulpit
Jack-in-the pulpit, Arisaema triphyllum, Arum Family (Arcaceae) Description: Distinctive “Jack-in-the pulpit” formation grows beneath large leaves. Flowers: curving ridged hood (the spathe or “pulpit”), green or purplish-brown, often streaked or mottled, envelops an erect club (the spadi or “Jack”) 2-3″ (5-7.5 cm) long. Spadix bears tiny seperate male and female flowers at the base. Leaves: [...]
False Nettle
False Nettle, Boehmaria cylindica, Nettle Family (Urticaceae) Description: Tiny greenigh flowers are in small, head-like clusters, arranged in continuous or interrupted spikes in the axils of opposite leaves. Plant lacks stinging hairs. Flowers: less than 1/12″ (2 mm) long; males flowers usually in interrupted spikes, with calyx 4-parted, stamens 4; female flowers mostly in continuous [...]
Wood Nettle
Wood Nettle, Laportea canadensis, Nettle Family (Urticaceae) Description: Clusters of small, greenish flowers are in the leaf axils on a stout stem with stinging hairs; female flowers are in loose, elongated clusters in upper ails; male flowers in shorter clusters in lower axils. Flowers: about 1/6″ (4 mm) long; female with 4 sepals, 1 pistil; [...]
Stinging Nettle
Stinging Nettle, Urtica dioica, Nettle Family (Uriticaceae) Description: A 4-angled stem, covered with many bristly, stinging hairs, has slender, branching, feathery clusters of minute greenish flowers in the leaf axils. Flowers are unisexual, with either male or female on a given plant, or on the same plant with males in upper leaf axils, females lower. [...]
Marijuana
Marijuana; Hemp, Cannabis sativa, Hemp Family (Cannabinaceae) Description: Coarse, branching plant with erect stems and clusters of small greenish flowers in the leaf axis. Flowers: to 1/8″ (3 mm) wide; male and female on seperate plants. Leaves: palmately divided, hairy, with 5-7 long narrow, coarsely toothed, tapering leaflets 2-6″ (5-15 cm) long. Height: 3-10′ (90-300 [...]
Common Ragweed
Common Ragweed, Ambrosia artemisiifolia, Sunflower Family (Asteraceae) Description: Coarse, hairy- stemmed annual with inconspicuous flowers in elongated clusters. Flowers: male, small yellow-green, packed with yellow stamens, borne in heads of 15-20 florets each, arranged on slender clusters 1-6″ (2.5-15 cm) long, near top of plant (hundreds of heads per plant); female, small clusters in small [...]