ROSACEA. 99 



4. AMYGDALUS. Willd. Almond. 



Specific character as in Persica, except the fruit, which is 

 not fleshy ; compressed. Stone perforate and furrowed, ovate, 

 compressed, one edge acute, the other broad, obtuse. 



1. A. communis, Willd. Common Almond. 



leaves lanceolate, serrate, with the lower serratures glandular; /lowers in pair*, 

 sessile, appearing before the lea res. Native of Barbary. Scarcely cultivated in. 

 this country, 10 to 20 feet high. 



2. A. PUMILA, Dwarf double-flower iny Almond. 



Leaves lanceolate, doubly-serrate; jffowers in pedicels. A low branching shiub, 

 2 to 3 feet high. Native of China. Highly ornamental, common in cultivation. 

 Flowers very double, pale rose-color, very numerous, clothing the whole shrub in 

 tiieir roseate hue while the leaves are yet small. May, June. 



Sub-order II. ROSACEiE proper. 



Calyx free from the ovaries, but sometimes enclosing 

 them in its tube. Pistils few to many, (sometimes single); 

 fruit achenia or follicular. 



Tribe 1. SPIRAEA. The Meadow-sweet Tribe. 



5. SPIRJEA. Linn. Meadow-sweet. 



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

 Stamens 10 to 50 exserted. Carpels 3 to 12, distinct, 

 rarely united at base, follicular, sessile, rarely stiped. Seeds 

 2 to 15. — Unarmed perennial shrubs cr herbs, with alter- 

 nate leaves and branches, and white or i ose-colored flowers ; 

 rarely dioecious; never yellow. 



* Shrubby ; leaves lobed and toothed. 



1. S. OPULIFOLIA, L. Nine-bark. 



Nearly smooth ; leaves roundish, somewhat 3-lobed and cordate, doubly-toothed 

 and crenate, petioled; corymb umbel-like; ptdictls filiform; carpels 3 to 5, at length 

 spreading. 



Rocky river banks and along streams; common. June. A shrub 4 to 10 feet 

 high, much branched. Leaves 1 to 2)4 inches long, nearly as wide, sometimes 

 cordate at base with 3 obtuse lobes above. Corymbs resembling simple umbels, 

 hemispherical, 1 to 2 inches in diameter. Flowers white, often tinged with purple. 

 Follicles diverging smooth, purplish, 2-seeded. 



* * Shrubby; leaves entire or toothed. Spir^a propef. 



2. S. CORYMBOSA, Raf. Meadow-sweet. 



Nearly smooth ; leaves oval or ovate, on short petioles, whitish beneath. Incite!/ 

 eerrato towards the apex; corymbs large and fiat, several times compound, term;, 

 oa!; carpels 3 to 5-scedcd, 



