GENUS 24. 



ROSE FAMILY. 



271 



4. Geum macrophyllum Willd. Large-leaved 

 Avens. Fig. 2278. 



Geum macrophyllum Willd. Enum. 557. 1809. 



Stout, erect, bristly-pubescent, simple or branched 

 above, i-3 high. Stipules broad, foliaceous; basal 

 leaves petioled, lyrate-pinnate, the terminal segment 

 much the largest, reniform, orbicular or cordate, 

 crenulate-dentate, 3-7-lobed; lateral leaflets 3-6, 

 oval or obovate, with smaller ones interspersed or 

 borne on the petiole; stem-leaves short-petioled or 

 sessile, the leaflets or lobes 2-4, cuneate ; flowers 

 several, terminal, short-peduncled, yellow, s"-io" 

 broad; petals obovate, exceeding the acute reflexed 

 calyx-lobes ; receptacle nearly glabrous ; style slen- 

 der, jointed, pubescent, at least below, 3"-s" long. 



In low grounds, Newfoundland to Alaska and British 

 Columbia, south to New York, Missouri, Colorado and 

 California. Also in northern Europe. May-July. 



5. Geum strictum Ait. Yellow Avens. 

 Fig. 2279. 



Geum strictum Ait. Hort. Kew. 2 : 217. 1789. 

 Geum canadense Murr. Comni. Goett. 5 : 34. pi. 4. f. B. 

 1783. Not Jacq. 1772. 



Erect or ascending, pubescent, branched above, 2-$ 

 high. Stipules broad, foliaceous; basal leaves lyrate- 

 pinnate; leaflets 5-7, obovate, cuneate, dentate or lobed, 

 with a few smaller ones interspersed, the terminal one 

 largest, broadly ovate or cuneate; stem-leaves sessile or 

 short-petioled, with 3-5 ovate or oblong acute seg- 

 ments; flowers yellow, similar to those of the preceding 

 species ; receptacle downy-pubescent ; style slender, 3"- 

 4" long, jointed, pubescent below. 



In swamps or low grounds, Newfoundland to British 

 Columbia, south to New Jersey, Pennsylvania, Missouri and 

 New Mexico. Also in northern Asia. June-Aug. A 

 hybrid with G. canadense has been found in eastern Penn- 

 sylvania. Herb-bennet. Black-bur. Camp-root. 



6. Geum vernum (Raf.) T. & G. Spring Avens. 

 Early Water Avens. Fig. 2280. 



Stylipits vernus Raf. Neog. 3. 1825. 



Geum vernum T. & G. Fl. N. A. i : 422. 1840. 



Erect or ascending, slender, pubescent with spread- 

 ing hairs, or glabrate, simple or nearly so, 6'-2 high. 

 Basal leaves tufted, petioled, with a single orbicular- 

 reniform dentate 3~5-lobed leaflet, or pinnate with 3-7 

 obovate or oval more or less dentate and lobed ones; 

 stem-leaves few, sessile or short-petioled, pinnate or 

 pinnatifid; flowers few, terminal, corymbose or race- 

 mose, erect, about 2" broad; calyx-lobes ovate, acute, 

 reflexed ; bractlets none ; petals yellow, spreading ; head 

 of fruit stalked; style glabrous, jointed, about 2" long; 

 receptacle glabrous. 



Shaded places, Ontario to West Virginia and Tennessee, 

 west to Illinois, Kansas and Texas. Naturalized from the 

 West in New Jersey, Pennsylvania and southern New York. 

 April-June. 



