XLVI. ROSACEA. 239 
Bs at . ‘ 
A large proportion of these are natives of temperate climates north of the equator. Fer em 
° Properties.—A highly important order, whether we regard its delicious fruit, its medicinal products, or 
the beauty of its flowers. None of its species (excepting those of the Almond tribe) are eet 
An astringent principle characterizes the family, residing chiefly in the bark and the roots. * he pet cs) 
the blackberry have been used in medicine as an astringent; those of Gillenia, as an erties nar a 
pia, as a vermifuge. The petals of Rosa damascena, yield the well known fragrant oil, ¢ ee ottar of 
rose. The Almond, Peach, &c., abound in prussic acid, a deadly poison, residing chiefly in the ermels. 
Of the Rosacew, as ornamental flowering shrubs, it is scarcely necessary to speak. 
Ve Say 
‘Res 
FIG. 44.—1. Potentilla arguta, flower and Jeaf. 2. Vertical section of a flower with the petals removed, 
showing 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- 
gynous stamens, the ovaries, &c. 7. Enlarged carpel. 8. Fruit, consisting of the enlarged receptacle 
with the acheniaexternal. 9. Perigynous stamens of Rubus Ideus. 10. Fruit, the fleshy carpels aggre- 
gated. 11. 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. 
; ce 5. Sibbaldia. 24 
} comp. Scauline. ? Sta. 00. Potentilia. 12 
not comp.. ¢all radical. . Waldsteinia. 16 
caudate. ( Leaves simple. . . Dalibarda. 15 
fonadry. }and caudate with §PetalsS8or9. Dryas. 25 
receptacle ( the persistent style. ? Petals 5. . Geum. 17 
on a juicy § which is sweet andeatablein . Fragaria, 14 
Achenia jon a juicy 2butinsipidin . . Comarum. 13 
Compound fruit (116, 14, a) of many aggregate drupes. . Rubus. 11 
Lvs. simple or pinnate. Spirea. 21 
10-seeded..... Leaves trifoliate. . __.\ Gillenia. 22 
Q— 
3—50. | Follicles Piaeodes, Shrub with simple lvs. (Fls. double.) Kerria. 
globose. Fr. glab. not glauc. Cerasis. 
Fruit glabrous. Prunus. 
Barwon td 
rd nucleus smooth, .. . . €compr. Pruit pubescent. Armeniaca. 
2 Tonlys 5 sae. §Fruit fleshy. . Persica. __ 
§ (naked, ( Fruita drupe ; ( nucleus perforated and furrowed. ? Fruit dry. . Amygdalis. 
8 Stamens 1—4. Lvs.palm. Alchemiila. 
S Stamens4. Lvs. pinnate. Sangwisorba. 18 
& es 0.( Stamens 20—30. . . Poterium. 19 
2 ya spoet 1—4. (Petals 5. Stamens 12—15..  . Agrimonia. 20 
. } & but enclosed in its tubes, 2 Carpels numerous. Petals 5—00. Sta. 00,  . Rosa. 10 
S Pome with 1—5 1-seeded cells: . . Crategus. 6 
= Pome with 3—5 2-seeded cells. . . Pyrus. 7 
adherentto _ § Petals roundish. . .( Pome with 5 many-seeded cells. . . Cydonia. 8 
é § the calyx tubé. ? Petals lance-obovate. Pome with 5 double cells. . € . Amelanchier. $ 
21 
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