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

Tribe I. HOTTONIEÆ. Ovary wholly free; ovules anatropous. Aquatic; immersed leaves pectinate.

1. Hottonia. Corolla short salver-form. Flowers verticillate and racemose.

Tribe II. PRIMULEÆ. Ovary wholly free.

[*] Stemless, leaves all in a cluster from the root; capsule dehiscent by valves or teeth.

2. Dodecatheon. Corolla reflexed, 5-parted. Stamens exserted, connivent in a cone.

3. Primula. Corolla funnel-form or salver-shaped, open at the throat. Stamens included.

4. Androsace. Corolla short, very small, constricted at the throat. Stamens included.

[*][*] Stems leafy; corolla rotate (none in Glaux); leaves entire.

[+] Capsule dehiscent vertically by valves or irregularly, mostly globose.

5. Trientalis. Corolla mostly 7-parted. Stem leafy only at the summit.