XLVIII. ROSACEA. 



239 



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



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

 the beauty of its flowers. None of its species (excepting tliose of the Almond tribe) are unwholesome. 

 An astringent principle characterizes the family, residing chiefly in the bark and the roots. The roots oi 

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

 iiia, as a vermiluee. The petals of Rosa damascena. yield the well known fragrant oil, called oitar of 

 •rose. The Almond, Peach, &c., abound in prussic acid, a deailly poison, residing chiefly in the kernels. — 

 tif the RosaoeaB, as ornamental flowering shrubs, it is scarcely necessary to speak. 



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

 showing the perigynous disk, stamens, ovaries. <Src. 3. Enlarged ovary and style. 4. Mature ovaiy. 

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

 gynous stamens, the ovaries, &c. 7. Enlarged carpel. 8. Fruit, consisting of the enlarged receptacle 

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

 gated. 11. Section of the fruit. 1'2. Flower of the apple tree. 13. Vertical section of a rose, showing 

 the distinct carpels in the calyx tube. 



Conspectus of the Genera. 



< Sta. 5. Siblaldia. 24 



C Leaves < cauline. \ Sta. 00. PotenrUla. 12 



("not < comp.. Ml radical. . Wahlsteinia. \S 



1 caudate. ( Leaves simple. . . Dalibarda. 1.5 



("on a dry 1 and caudate with < Petals 8 or 9. Dryas. 23 



i receptacle L the persistent sfs'le. (Petals 5. . Geum. 17 



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



receptacle \ but insipid in ". . . . . Coniarum. 13 



I Compound fruit (116, 14, «) of many aggregate drupes. . Rubvs. II 



I< 4 Lvs. simple or pinnate. Spires. 21 



Ja— 10-seeded ? Leaves trifoliate. . . GilJenia. 22 



3—50. iFolLicles I l-seeded. Shrub with simple Ivs. (FIs. double.) Kerria. 23 



( globose. Fr. fflab. not clauc. Cerasug. I 



< 4 Fruit glabrous. Prvniis. 2 



C nucleus smooth, .... ( compr. ? Fruit pubescent. Armeniaca. 3 



1 only < ^ Fruit fleshy. . Pemira. 4 



Fruita drupe ;( nucleus perforated and fnnowed. ? Fruit dry. . Annis-dalis. 5 



P I ■ ( Stamens 1—4. Lvs. palm. AlchemWa. 26 

 S J < Stamens 4. Lvs. pinnate. Sans-ufsorba. 18 



(•i j S Pet. 0. ' Stamens 20—30. . . Poterium. 19 



"g] < Carpels 1—4. ( Petals 5. Stamens 12— 13. . . Asrimonia. 20 



•S Lbut enclosed in its tubes. {Carpels numerous. Petals 5 — 00. Sta. 00. . Rosa. 10 



f Pome with 1—5 Iseeded cells. . . Cratagua. 6 



< Pome with 3—3 2-seeded cells. . . Pijriw. 1 



adherent to < Petals roundish. . . r Pome with 5 many-seeded cells. . Cydonia. 8 

 the calyx tube. ? Petals lance obovate. Pome with 5 double cells. . . . Anielandiicr. 3 



21 



