116 ROSACEA. (ROSE FAMILY.) 



8. DRYAS, L. Dryas. 



Calyx flattish, 8 - 9-parted. Petals 8-9, large. Otherwise like Geum $ Sie- 

 versia. — Dwarf and matted slightly shrubby plants, with simple toothed leaves, 

 and solitary large flowers. (Name from Dryades, the nymphs of the Oaks, tho 

 foliage of some species resembling oak-leaves in miniature.) 



1. I>. illtcgTlfolia, Vahl. Leaves oblong-ovate, slightly heart-shaped, 

 with revolute margins, nearly entire, white-downy beneath, flowers white. — 

 White Mountains, New Hampshire, Prof. Peck, according to Pursh ; but not 

 since met with : therefore veiy doubtful. (Eu.) 



9. GEUM, L. Avens. 



Calyx bell-shaped or flattish, deeply 5-cleft, usually with 5 small bractlets at 

 the sinuses. Petals 5. Stamens many. Achenia numerous, heaped on a coni- 

 cal or cylindrical dry receptacle, the long persistent styles forming hairy or 

 naked and straight or jointed tails. Seed erect. — Perennial herbs, with pin- 

 nate or lyrate leaves. (Name from yevo>, to give an agreeable flavor, the roots 

 being rather aromatic.) See addend. 



§ 1. GEUM proper. — Styles jointed and bent near the middle, the lower portion 

 smooth and persistent, naked, hooked at the end after the deflexed and mostly hairy 

 upper joint falls away : head of fruit sessile : calyx-lobes reflexed. (Flowers some- 

 what panicled at the summit of the leafy stem.) 



1. G. album, Gmelin. Smoothish or softly pubescent; stem slender 

 (2° high) ; root-leaves of 3 - 5 leaflets, or simple and rounded, with a few minute 

 leaflets on the petiole below ; those of the stem 3-divided, lobed, or only toothed ; 

 stipules small ; petals white (3" long), obovate or oblong, fully as long as the 

 calyx ; receptacle and ovaries bristly-hairy ; upper joint of the style a little hairy. 

 Borders of woods, common. May- Aug. — Near the European G. urbanum. 



2. G. Virgiiiiunum, L. Bristly-hairy, especially the stout stem; 

 lower and root-leaves pinnate, very various, the upper mostly 3-parted or 

 divided, incised ; stipules small ; petals greenish-white, shorter than the calyx ; re- 

 ceptacle and ovaries glabrous. — Woods and low grounds ; common northward. — 

 Clearly different from the last. 



3. G. laiaciopliyllum, Willd. Bristly-hairy, stout (l°-3° high); 

 root-leaves lyrately and interruptedly pinnate, with the terminal leaflet very large 

 and round-heart-shaped ; lateral leaflets of the stem-leaves 2-4, minute, the ter- 

 minal roundish, 3-cleft, the lobes wedge-form and rounded; petals yellow, obovate, 

 longer than the calyx ; receptacle of fruit nearly naked; achenia bristly above. — 

 Around the base of the White Mountains, New Hampshire : also North Illinois 

 and northward. June. (Eu.) 



4. G. Strictum, Ait. Somewhat hairy (3° -5° high) ; root-leaves inter- 

 ruptedly pinnate, the leaflets wedge-obovate ; leaflets of the stem-leaves 3-5, 

 rhombic-ovate or oblong, acute ; petals yellow, roundish, longer than the calyx ; recep- 

 Uucle downy ; achenia bristly above. — Moist meadows ; common, especially 

 northward. July. (Eu.) 



