This section is from the book "The Commonly Occurring Wild Plants Of Canada", by Henry Byron Spotton. Also available from Amazon: The Commonly Occurring Wild Plants Of Canada.
Shrubs with simple stipulate leaves, and small regular perigynous greenish or whitish flowers. Stamens opposite the petals, and with them inserted on the margin of a fleshy disk which lines the calyx-tube. Fruit a berry-like drupe, or a pod.
1. Rham nus. Petals minute, or none. Drupe berry-like. Calyx and disk free from the ovary.
2. Ceano'thus. Petals white, long-clawed, hooded. Fruit dry, dehiscent. Calyx and disk adherent to the base of the ovary.
Tourn. Buckthorn. R. alnifo'lia, L'Her. A low erect shrub, not thorny, with oval, acute, serrate leaves, and apetalous flowers. Fruit a 3-seeded berry. - Swamps.
L. New Jersey Tea. 1. C. America'nus, L. A shrubby plant with downy branches, and ovate, 3-ribbed, serrate leaves. Flowers in white clusters at the summit of the naked flower-branches.
Sepals and petals white, the latter hooded, and with slender claws. Pedicels also white. - Dry hill-sides.
2. C. ova'tus, Desf. (C. ovalis, Bigel.), has the leaves narrowly oval or elliptical-lanceolate, finely serrate, and glabrous or nearly so. The flowers, also, are larger than in No. 1. - South-western Ontario.
 
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