Northern Prairie Wildlife Research Center
Aquatic and Wetland Vascular Plants of the Northern Great Plains
Rosaceae - The Rose Family
A large, diverse family commonly divided into several distinct subfamilies,
many species cultivated for fruit and ornament. Those treated here herbs and
shrubs with alternate, simple or compound leaves, the leaves usually stipulate
(stipules absent in Spiraea). Flowers solitary or usually in cymose
or paniculate inflorescences, perfect, regular, perigynous; sepals 5,
sometimes alternating with 5 or more somewhat smaller bractlets, the sepals
attached around the rim of a saucerlike, disklike or cupulate hypanthium; petals
5, usually yellow, white or pink, frequently small and inconspicuous; stamens
15-many, seldom as few as 10, inserted near the rim of the hypanthium; carpels
5-many, seldom fewer than 5, separate, the ovaries ripening as an aggregate
of achenes or follicles, these often enclosed by the persistent hypanthium.
||Shrub with simple leaves; flowers white; fruit of
5 or fewer follicles
||Herbs with compound leaves; flowers yellow or yellowish
to pinkish; fruit an aggregate of many achenes.
||Styles inconspicuous, not elongating after flowering,
||Styles conspicuous, elongating after flowering and
persistent in fruit, jointed.
26. Rosaceae, the Rose Family
1. Geum L.-- Avens
2. Potentilla L. -- Cinquefoil
- 1. Geum rivale L. -- Water or purple
3. Spiraea L. -- Meadosweet
- 1. Potentilla anserina L. -- Silverweed
- 2. Potentilla norvegica L. -- Strawberryweed
- 3. Potentilla palustris (L.) Scop.
-- Bog cinquefoil
- 4. Potentilla paradoxa Nutt. ex Torr.
& Gray -- Bushy cinquefoil
- 5. Potentilla rivalis Nutt. -- Brook
- 1. Spiraea alba Du Roi
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