298 ORDER XLIV. ROSACEA. 



4. Flowers in spikes Sanguisorba, 9 



Flowers In umbels Prwnua, 2 



Fiou ers In racemes Cerasua, -1 



5. Ovaries 2— G 6 



Ovaries more than 6 9 



8. Leaves Bimple, undivided Spircea, 5 



l>( i\ es lobed or compound 7 



7. Flowers white Gillenia, 6 



F lowers yellow 8 



S. Flowers on a scape Waldstein ia, 8 



Flowers on a peduncle Agrimonies 10 



9. Flowers yellow Potentitta, 11 



Flowers not yellow 10 



10. Receptacle dry Geum, 1 



Receptacle fleshy 11 



11. Carpels inclosed bj>- the receptacle Pom, 14 



Carpels imbedded in the receptacle Fragaria, VI 



Carpels pulpy Jiubus, 18 



12. Thorny shrubs Crategus, 15 



Unarmed shrubs or small trees 13 



18. Flowers in racemes Amelanchier, 17 



Flowers not in racemes Ft/rus, 16 



Sub-Order I.— CHRYSOBALA'NE^E. 



Calyx inferior. Petals and stamens more or less irregular. 

 Fruit a drupe. 



Genus 1.— CHRYSOBAL'ANUS. L. 11—1. 

 (From the Greek chrusos, gold, and balance, an acorn, in reference to its yellow fruit) 



Calyx 5-cleft, persistent, campanulate, with nearly equal seg- 

 ments. Petals 5. Stamens numerous, those next the ovary 

 usually shortest and sterile; ovary sessile ; ovules 2. Fruit a 

 drupe, with very little pulp, 1-seeded. Shrubs with flowers in 

 terminal or axillary paniculate cymes. 



1. C. oblongifo'lius. (Mich.) Stem slender, prostrate, branching. 

 Leaves nearly sessile, oblong, or lanceolate-oblong, slightly erenulate, 

 glabrous, or tomentose beneath. Flowers small, terminal. Petals 

 nearly round. Fruit oblong, about 1 inch in length. — "White. ^ . May 

 — June. Geo. and Ala. 1 — 2 feet. 



Sub-Order IT.— AMYGDA'LE^E. 



Calyx inferior. Fruit a drupe, 1-seeded. Bark yielding 

 gum. 



Gents II.— l'UU'XUS. Tourn. 11—1. 

 (Ancient name of the Flum.) 



Calyx 5-parted, somewhat urceolate. Petals spreading, un- 

 guiculate. Stamen* numerous. Ovary with 2 pendulous 

 ovules, glabrous. Fruit an ovate drupe, fleshy, with a com- 

 pressed nucleus, having gprooved margins. Small trees and 

 Bhrubs. Leaves with ;i convolute vernation, serrate. Flowers 

 Usually appearing before the haves. Plum. 



