XLVIII. ROSACEA. 



239 



A large proportion of these are natives of temperate climates north of the equator. 



Properties —A highly important order, whether we regard its delicious fruit, its medicinal products, or 

 the beauty of its flowers. None of it.s species (excepting those of the Almond tribe) are unwholesome. 

 An astrineent principle characterizes the family, residing chiefly in the bark and the roots. The roots of 

 the blackberry have been used in medicine as an astringent ; those of Gillenia, as an emetic ; Agrimo- 

 nia, as a vermifuge. The petals of Ro-sa damascena, yield the well known fragrant oil, called ottar (if 

 rose. The Almond, Pe.ich. &c., abound in [irussic acid, a deadly poison, residing chiefly in the kemeU. — 

 Of the Ro3arx:a:, as ornamental flowering shrubs, it is scarcely necessary to speak. 



. j: 



nm Lr 



FIG. 44.— 1. Potentilla arguta, flower and leaf. 2. Verticil section of a flower with the petals removed, 

 ."showmg the perigynous disk, stamens, ovaries, &c. 3. Enlarged ovary and style. 4. Mature ovary. 

 5. section showing the seed and funiculus. 6. Vertical section of a flower of Fragaria, showing the peri- 

 gynou-s stamens, the ovaries, &c. 7. Enlarged carpel. 9. Fruit, consisting of the enlarsed receptacle 

 with the achenia external. 9 Perigynous stamens of Rubus Idseus. 10. Fruit, the fleshy carpels aggre- 

 irated. n. Section of the fruit. 12. Flower of the apple tree. 13. Vertical section of a rose, showing 

 the distinct carpels in the calyx tube. 



Conspectus of the Genera. 



5 Sta. 5. Sibbaldia. 24 



(Leaves <cauline. JSta. 00. Pntentilla. 12 



rnot < comp.. Ml radical. . Waldsteinla. \e 



I caudate, t Leaves simple. . . Dalibarda. 15 



f on a dry I and caudate with ^ Petals 8 or 9. Dryas. S5 



j receptacle (.the persistent style. ^ Petals 5. . Geum. 17 



on a juicy i which is sweet and eatable in . Fragaria. 14 



("Achenia (.receptacle > but insipid in Comamm. 13 



I Compound fruit (116, 14, a) of many aggregate drupes. . Riibijs. 11 



^ (Lvs. simi)le or pinnate. Spirra. 21 



I t2— 10-seeded ? Leaves trifolinte. . . Gillenia. 2-i 



fS — 60. L Follicles n-seeded. Shrub with simple Ivs. (Fls. double ) A>rr;a. 23 



( globose. Fr. glab. not glauc. Cerasits. l 



< 5 Fruit glabrous. Prumis. 



(nucleus smooth ( compr. ? Fruit pubescent. 



-■ J 1 only I < Fruit fleshy. . 



g ("naked, iFruitadrupe;' nucleus perforated and furrowed. ^ Fruit dry. 

 a (Stamens 1—4. Lvs.palm. 



^ <StKmens4. Lvs pini 



5 Pet. 0. ' Slamens 20—30. 

 (Carpelsl— 4. ^PetalsS. Stamens 12— 15 . 

 Lbut enclosed in its tubes, o-arpels numerous. Petals 5 — 00. Sta. 00. 

 i ( Pome with 1—5 Iseeded cells. 



< Pome with 3—5 2-.seeded cells, 

 adherent to < Petals roundish. . .( Pome with 5 many-seeded cells. . 

 L the calyx tube. ; Petals lance-oliovate. Pom« .with 5 ilouble cells. . 



Armeniaca. 3 



Persira. 4 



Amvsdalis. 5 



Alchinulln. 5C 

 Sanguinorha. 18 



Po'erivm. 19 



Asmmonia. 20 



/?0S(7. 10 



Cratcegua. 6 



Pyriis. 7 



Cydonia 8 



Amelanchier. 9 



21 



