ROSACES. 221 



4. P. DOMESTICA (Plum), Leaves oval or ovate-lanceolate ; flowers 

 white ; drupe round, to ovoid. A small tree, 10-15 feet high, with unarmed 

 branches, long cultivated for its delicious fruit, sometimes black, sometimes 

 white. May. 



5. P. SEROTINA (Wild Black Cherry). Leaves oval or oblong, smooth, 

 finely serrate, shining above ; petioles with 2 or more glands ; flowers white, 

 in spreading racemes ; drupe black, somewhat bitter ; bark bitter, tonic. A 

 tall, elegant tree. May. 



6. P. VIRGIN! ANA (Choke-Cherry). Leaves obovate, to oval, sharply ser- 

 rate ; petiole with 2 glands ; flowers sessile, in short, erect, spreading ra- 

 cemes ; drupes sub-globose, dark red ; extremely bitter and astringent. 

 Small tree, 5-20 feet high. May. 



2. Spiraea. Calyx 5-cleft, persistent. Petals 5, roundish, equal. 

 Stamens 10-50. Carpels 3-12, distinct, follicular, i-celled, l-io- 

 seeded. 



1. S. TOMENTOSA (Hardback). Stem shrubby, brittle, woolly-tomen- 

 tose, and rust-colored ; leaves ovate, or oblong, numerous, ferruginous- 

 tomentose beneath ; racemes short, dense, numerous, in a dense panicle ; 

 flowers pale purple, very small, numerous. A shrub, 2-3 feet high, in past- 

 ures and low grounds. July. 



2. S. SALICIFOLIA (Meadow-sweet). Nearly smooth ; leaves oblong-obo- 

 vate, sharply and doubly serrate ; flowers white, often tinged with red, in 

 dense, terminal panicles ; carpels 5, smooth. A common shrub, in meadows, 

 2-4 feet high. July-August. 



3. Gillenia. Calyx tubular-campanulate, 5-cleft. Petals 5, linear- 

 lanceolate. Stamens 10-15. Carpels 5. Styles filiform, terminal. 

 Follicles 3, 2-valved, 2-4-seeded. ^ 



G. TRIFOLIATA {Indian Physic). Stem shrubby at base, slender, and 

 nearly smooth, branching ; leaves 3-foliate ; leaflets ovate-oblong ; stipules 

 linear ; flowers rose-color, or nearly white, on long pedicels, in corymbose 

 panicles ; root emetic and cathartic. In woods, 2-3 feet high. June-July. 



4. Agrimonia. Calyx-tube armed with hooked bristles, contracted 

 at the throat, with a 5-cleft limb. Petals 5. Stamens 12-15. Ovaries 

 2. Styles terminal. Achenia included in rim of the calyx, y. 



A. EUPATORIA (Agrimony). Stem erect, hirsute, branching ; leaves 5-7- 

 foliate, upper ones 3-foliate ; leaflets ovate, oval, coarsely toothed ; stipules 

 large ; flowers yellow, in spikes, on very short pedicels. A hairy plant, 2-4 

 feet high. July. 



5. Geum. Calyx deeply 5-cleft, with 5 alternate segments. Petals 

 5. Stamens numerous. Achenia numerous on the conical, dry recep- 

 tacle, it 



G. RIVALS (Water Avens). Stem erect, pubescent ; radical leaves inter- 

 rupted and lyrately pinnate ; cauline ones 3-foliate, or 3-lobed ; flowers few, 



