Shrubs or small trees; leaves silvery-scurfy or stellate-pubescent, entire, opposite or alternate; flowers perfect-polygamous or dioecious, clustered in the axils or at the nodes of twigs of the previous season, rarely solitary; fruit drupe-like, the base of the calyx becoming thick and pulpy, strictly inclosing the achene or nut.
I. Elaeeagnus. (Tourn.) L.
1. E. argentea. Pursh. Silvcrberry. II. Shepherdia. Nutt.
1. S. canadensis. (L.) Nutt. Canada Buffaloberry.
Herbaceous or shrubby plants; leaves entire or toothed, alternate or opposite; flowers axillary or in terminal spikes, perfect, symmetrical, calyx-tube adnate to the ovary, its lobes valvate in the bud or obsolete, petals convolute in the bud, sometimes wanting; fruit a many-seeded pod, seeds mostly silky-tufted.
I. Epilobium. L.
1. E. alpinum. L. Alpine Willow-herb.
2. E. angustifolium. L. Great Willow-herb.
3. E. latifolium. L. Water Willow-herb.
4. E. anagallidifolium. Lam. Mountain Willow-herb.
5. E. Hornemanni. Reichenb. Hornemann's Willowherb.
6. E. paniculatum. Nutt. Panicled Willow-herb.
7. E. clavatum. Trel. Few-flowered Willow-herb.
8. E. adenocaulon. Haussk. Northern Willow-herb.
9. E. luteum. Pursh. Yellow Willow-herb. II. Œnothera. L.
1. O. biennis. L. Common Evening Primrose. III. Circtaea. (Tourn.) L.
1. C. pacifica. Asch. and Mag. Pacific Enchanter's Nightshade.
2. C. alpina. L. Small Enchanter's Nightshade.
Aquatic or marsh plants; leaves various, crowded, often whorled; flowers inconspicuous, symmetrical, sessile in the axils of the leaves or bracts; fruit dry and indehiscent, with a single anatropous seed suspended from the summit of each cell.
I. Myriophyllum. (Vaill.) L.
1. M. spicatum. L. Spiked Water Milfoil. II. Hippuris. L.
1. H. vulgaris. L. Bottle Brush.
2. H, montana. Ledeb. Mountain Mare's Tail,