. 83 



2. § RosKA.. True Roses. 

 § Rosse, Juss. Gen. 335. (1789.) — § Rosoe, Dec. Prodr. 2. 596. (1825) ; 

 Lindl. Synops. 99. (1829.) 

 Nuts numerous, hairy, terminated by the persistent lateral style, and 

 enclosed within the fleshy tube of the calyx, which is contracted at its 

 orifice, where it is surrounded by a fleshy disk. Seed suspended. Sepals 5. 

 Petals 5. Stamens indefinite. — Shrubs, with prickly or naked stems. 

 Leaves pinnate. Flowers red, white, or yellow, usually fragrant. 

 Examples. Rosa, Lowea. 



3. § SpiRjEace^e. Spirceas. 

 \ SpircBffi, Juss. Gen. 339. (1789.)— § Ulmariae, Vent. Tahl. 3. 351. (1799.) 

 — § Spirseacese, Dec. Prodr. 2. 541. (1825); Lindl. Synops. 89. (1829.) 

 Follicles several, invested by the calyx. Seeds from 1 to 6, suspended 

 from the inner edges of the follicle. — Shrubs or herbaceous plants. 

 Examples. Spiraea, Gillenia, Schizonotus. 



?4. § NeuradejE. Neuradas. 

 § Neurade^, Dec. Prodr. 2. 548. (1825.) 



Calyx 5-cleft, with a short tube adhering to the ovarium, the lobes 

 somewhat incumbent or valvate in aestivation. Petals 5. Stamens 10. 

 Carpella 10, combined in a 10-celled compressed capsule. Seeds solitary, 

 obliquely pendulous. — Herbaceous plants, native of sandy plains, suffru- 

 tescent at the base, and usually decumbent. Leaves with 2 stipulse, downy, 

 sinuate-pinnatifid, or bipinnatifid. Seeds germinating in the capsule. 



Example. Neurada. 



Is not this rather a tribe of Ficoidese, as has been suggested by M, de 

 J ussieu ? to which, however, the want of albumen, the form of the embryo, 

 and the texture of the leaves, are objections. Dec. Prodr. 2. 548. 



LXXIV. POMACEiE. The Apple Tribe. 



RosACEiE, § Pomaceae, Juss. Gen. 334. (1789); Dec. Prodr. 2. 626. (1825.) — PoMACEiE, 

 LindL in Linn. Trans. 13. 93. (1821) ; Synops. 103. (1829.) 



Diagnosis. Polypetalous dicotyledons, with perigynous indefinite 

 stamens, ovaria jadhering more or less to the calyx, and alternate stipulate 

 leaves. 



Anomalies. In Amelanchier the simple ovaria are spuriously 2-celled. 

 In Crataegus the ovaria are very rarely solitary. 



Essential Character. — Calyx superior, 5 -toothed ; the odd segment posterior. 

 Petals 5, unguiculate, inserted in the throat of the calyx ; the odd one anterior. Stamens 

 indefinite, inserted in a ring in tlie throat of the calyx. Disk thin, clothing the sides of 

 the limb of the calyx. Ovaria from 1 to 5, adhering more or less to the sides of the calyx 

 and each other ; ovules usually 2, collateral, ascending, very rarely solitary ; styles from 1 

 to 5; stigmata simple. Fruit a pome, 1- to 5-celled, seldom spuriously lO-celled; the 

 endoearpium either cartilaginous, spongy, or bony. Seeds ascending, solitary. Albumen 

 none ; embryo erect, with flat cotyledons, or convolute ones in Chamaemeles, and a short 

 conical radicle — Trees or shrubs. Leaves alternate, stipulate, simple, or compound. Flowers 

 in terminal cymes, white or pink. 



Affinities. Closely allied to Rosaceos, from which they differ in the 

 adhesion of the ovaria with the sides of the calyx, and more or less with 

 each other. Their fruit is always a pome; that is, it is made up of a fleshy 

 calyx adhering to fleshy or bony ovaria, containing a definite number of 

 seeds. Pomacese are peculiarly distinguished by their ovula being in pairs, 

 and side by side; while Rosacese, when they have 2 or more ascending 



