116 ROSACES. (ROSE FAMILY.) 



8. BRYAS, 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, the 

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



1. D. integrifolia, 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 very doubtful. (Eu.) 



9. OKUM, 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 yfi>a>, to give an agreeable flavor, the roots 

 being rather aromatic.) See addend. 



i 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.) .ft?. 



1. O. all> ia ill, 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, lobcd, 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. urbannm. 



2. O. Virgiiiianiim, L. Bristly-hairy, especially the stout stem; 

 lower and root-leaves pinnate, very various, the upper mostly 3-partcd 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. O. macrophylllim, Willd. Bristly-hairy, stout (l-3 high), 

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

 and round-heart'sJiapcd ; 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 Hampsliire : also North Illinois 

 and northward. June. (Eu.} 



4. O. Strictum, Ait. Somewhat hahy (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- 

 tacle downy ; achenia bristly above. Moist meadows ; common, especially 

 northward. July. (Eu.) 



