The Manual of the Botany of the Northern United States / Including the District East of the Mississippi and North of North Carolina and Tennessee

by Asa Gray

3. Cephalanthus. Corolla tubular; lobes 4. Fruit inversely pyramidal, 2–4-seeded.

[+][+] Flowers twin; their ovaries united into one. Fruit a 2-eyed berry.

4. Mitchella. Corolla funnel-form; its lobes 4. A creeping herb.

[+][+][+] Flowers axillary, separate. Fruit dry when ripe. Herbs.

5. Spermacoce. Corolla funnel-form or salver-form; lobes 4. Fruit separating when ripe into 2 carpels, one or both of them opening.

6. Diodia. Fruit separating into 2 or 3 closed and indehiscent carpels; otherwise as n. 5.

III. STELLATÆ. Ovules solitary; leaves in whorls, without stipules.

7. Galium. Corolla wheel-shaped, 4- (or rarely 3-) parted. Calyx-teeth obsolete. Fruit twin, separating into 2 indehiscent 1-seeded carpels.

8. Sherardia. Corolla funnel-form. Calyx-lobes lanceolate. Flowers subsessile, involucrate.

1. HOUSTÒNIA, L.