POLYPETALOUS EXOGENOUS PLANTS. 249 



♦ Sterile JUaments flat or somewhat petaloid ; legumes oblong, 4-G-seeded, often 

 stipUate ; aquatic, prostrate. 



D. LACUSTRis, Willd. Herbaceous, floating ; leaves des- 

 titute of glands; pinnce 3 pairs; leaflets 20-30, alternate 

 and opposite, linear, obtuse; heads ovate, many-flower- 

 ed; peduncles 2-3-bracteate; /o?(;ers decandrous; legumes 

 somewhat falcate, oblong, stipitate ; spikes loose. Flowers 

 small, somewhat pediceled ; filaments of the lower ones 

 antheriferous ; leaflets somewhat lanceolate, broader at the 

 b ase. — Dru mmo nd. 



43. ROSE FAMILY. Order, Rosacea. 



Herls, shrubs, or ti^ees, with alternate stipulate leaves, 

 and regular /o?^er5; calyx of 3-8 (mostly 5) more or less 

 united sepals, and often with as many hracts; petals as 

 many (rarely none), inserted with the few or numerous 

 distinct stamens on the edge of the disk which lines the 

 tube of the calyx, mostly imbricated in the bud; ovaries 

 1-several, free, or more or less united with the calyx, and 

 with each other, 1-few ovuled ; seeds anatropous, and, with 

 few exceptions, without albumen; emhryo straight, with 

 large and thick cotyledons; fruit various. 



SYNOPSIS. 



Sub-order I. Chrysobalanese. Calyx bractless, free 

 from the solitary ovary. Style single, arising from the base 

 of the ovary. Ovules erect. Fruit a drupe. Trees or 

 shrubs. Leaves simple. 



1. Chuysobalanus. Calyx-limb persistent. Stone grooved. Low shrubs. j| 



Sub-order II. Amygdaleae. Calyx bractless, free 

 from the solitary ovary. Style single, terminal. Ovules 

 suspended. Fruit a drupe. Leaves simple. 



11* 



