[*][*] Ovary with narrow parietal placentæ, in fruit projecting inward more or less.
4. Phacelia. Corolla-lobes imbricated in the bud. Calyx destitute of appendages.
Tribe II. HYDROLEÆ. Ovary and capsule 2-celled, the placentæ often projecting from the axis far into the cells. Albumen fleshy. Leaves entire. Styles 2.
5. Hydrolea. Corolla between wheel-shaped and bell-shaped.
1. HYDROPHÝLLUM, Tourn. Waterleaf.
Calyx 5-parted, sometimes with a small appendage in each sinus, early open in the bud. Corolla bell-shaped, 5-cleft; the lobes convolute in the bud; the tube furnished with 5 longitudinal linear appendages opposite the lobes, which cohere by their middle, while their edges are folded inward, forming a nectariferous groove. Stamens and style mostly exserted; filaments more or less bearded; anthers linear. Ovary bristly-hairy (as is usual in the family); the 2 fleshy placentæ expanded so as to line the cell and nearly fill the cavity, soon free from the walls except at the top and bottom, each bearing a pair of ovules on the inner face. Capsule ripening 1–4 seeds, spherical.—Perennials, with petioled ample leaves, and white or pale blue cymose-clustered flowers. (Name formed of ὕδωρ, water, and φύλλον, leaf; of no obvious application.)
[*] Calyx with minute if any appendages; rootstocks creeping, scaly-toothed.
1. H. macrophýllum, Nutt. Rough-hairy; leaves oblong, pinnate and pinnatifid; the divisions 9–13, ovate, obtuse, coarsely cut-toothed; root-leaves 1° long; peduncle shorter than the petiole; calyx-lobes lanceolate-pointed from a broad base, very hairy; flowers (6´´ long) crowded in a globular cluster; anthers short-oblong.—Rich woods, Ohio to Va. and Ala., west to the Mississippi. July.
2. H. Virgínicum, L. Smoothish (1–2° high); leaves pinnately divided; the divisions 5–7, ovate-lanceolate or oblong, pointed, sharply cut-toothed, the lowest mostly 2-parted, the uppermost confluent; peduncles longer than the petioles of the upper leaves, forked; calyx-lobes narrowly linear, bristly-ciliate; flowers 3´´ long; anthers oblong-linear.—Rich woods. June–Aug.
3. H. Canadénse, L. Nearly smooth (1° high); leaves (3–5´ broad) palmately 5–7-lobed, rounded, heart-shaped at base, unequally toothed, those from the root sometimes with 2–3 small and scattered lateral leaflets; peduncles mostly shorter than the petioles, forked, the nearly white flowers on very short pedicels; calyx-lobes linear-awl-shaped, nearly smooth, often with minute teeth in the sinuses.—Damp rich woods, N. Eng. to the mountains of Va., and west to the Mississippi. June–Aug.—Rootstocks thickened and very strongly toothed in 2 rows by the persistent bases of the stout petioles.