An illustrated flora of the An illustrated flora of the northern United States, Canada and the British possessions : from Newfoundland to the parallel of the southern boundary of Virginia and from the Atlantic Ocean westward to the 102nd meridian ed2illustratedflo02brit Year: 1913 ROSACEAE. 7. Genm rivale L. Purple or Water Avens. Fig. 2281. Gcum rivale L. Sp. PI. 501. 1753. Erect, simple or nearly so, pubescent, i°-3° high. Basal leaves lyrately and interruptedly pinnate, petioled, the lateral segments generally few and small, the terminal 1-3, much larger, all sharply and irregularly lobed
An illustrated flora of the An illustrated flora of the northern United States, Canada and the British possessions : from Newfoundland to the parallel of the southern boundary of Virginia and from the Atlantic Ocean westward to the 102nd meridian ed2illustratedflo02brit Year: 1913 ROSACEAE. 7. Genm rivale L. Purple or Water Avens. Fig. 2281. Gcum rivale L. Sp. PI. 501. 1753. Erect, simple or nearly so, pubescent, i°-3° high. Basal leaves lyrately and interruptedly pinnate, petioled, the lateral segments generally few and small, the terminal 1-3, much larger, all sharply and irregularly lobed and dentate; stem-leaves distant, short-petioled or sessile, simple, or 3-foliolate; flow- ers few, terminal, purple or purplish, nodding, g'-i2' broad; petals obovate, emarginate, abruptly narrowed into a claw; calyx-lobes spreading, purple; head of fruit stalked in the calyx; achenes pubescent; style jointed, plumose below, 3'-4' long. In swamps and low grounds. Newfoundland to British Columbia, New Jersey, Pennsylvania. Michigan and Colorado. Also in northern Europe and Asia. Indian- chocolate. Evan's- or chocolate-root. Drooping avens. Maiden-hair. Throatwort. Throat-root. Cure-all. May- July. Geum piilchrum Fernald, similar, but with smaller Vermont and Alberta, is presumably a hybrid of this species 25. SIEVERSIA Willd. Mag. Gesell. Naturfr. Berlin 5: 397. 1811. Mostly low perennial herbs, with odd-pinnate leaves. Flowers in cymes, or solitary, yellow or purplish. Calyx obconic or hemispheric, 5-lobed and generally 5-bracteolate. Petals 5. Stamens numerous; filaments filiform. Carpels many, on a short hemispheric receptacle. Style terminal, persistent, filiform, pubescent or plumose, not jointed, generally elongating in fruit. Seeds erect, basal. [Named in honor of Sievers.] About 15 species of temperate alpine or arctic regions; besides the following five or six others occur in western and arctic North America. Type species: Dryas anemonoides Pall. one of the basal l
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