. 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. Botany. 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 s
. 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. Botany. 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 leaves orbicular-r eate ; style plu
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
