Dicotyh or Exogenoiis Plants. 75 



1. Genus CAL-LIT'-RI-CHE. — Flowers monoecious, solitar}^ or 2 or 

 3 in the axils, wholly naked ; plants low, slender, and usually tufted ; 

 floating leaves obovate and 3-nen-ed, the submersed ones linear. 



Cal-lit'-ri-che pa-lus'-tris L. (C verna L.) Water Starwort. — Fruit 

 ^ line long, higher than broad ; stigmas shorter than the fruit. 



Cal-lit'-ri-che het-er-o-phyl'-la Ph. Water Starwort. — Fruit smaller, 

 as broad as or broader than high; stigmas as long as the fruit. 



XLV. LIM-NAN-THA'-CE-ZE. FALSE MERMAID FAMILY. —Low, ten- 

 der annuals; flowers 3-merous; sepals persistent; carpels nearly dis- 

 tinct, with a common stj-le, 1-ovuled; leaves pinnate. 



1. Genus FL(ER'-KE-A. — Sepals 3, petals 3, shorter than the calyx, 

 stamens 6, ovaries 3 ; flowers minute, solitary on axillary peduncles. 



Floer'-ke-a pro-ser-pin-a-coi'-des Willd. False Mermaid. — Leaflets 3-5, 

 lanceolate, sometimes 2-3-cleft; a small plant in marshes and on river- 

 banks. 



XLVL Order AN-A-CAR-DI-A'-CE-yE. CASHEW FAMILY. — Trees or 

 shrubs ; flowers small, regular ; ovary 1 -celled, but styles or stigmas 3. 



1. Genus RHUS. — Trees or shrubs with resinous or milky, acrid 

 juice; flowers small, regular; juice or exhalations often poisonous. 



A. Flowers in a terminal, thyrsoid panicle ; fruit crimson. 



Rhus hir'-ta (L.) Sudw. {R. typhina L.) Staghorn Sumach. — Branches 

 and stalks densely-velvety hairy; leaflets 11-31, pale beneath. 



Rhus glab'-ra L. Smooth Sumach.— 5wc(V/?, somewhat glaucous; 

 leaflets 11-31, whitened beneath. 



Rhus co-pal-li'-na L. Dwarf Sumach. — Branches and stalks downy; 

 petioles wing-margined between the 9-21 leaflets; flowering later 

 than the preceding one. 



A. Flowers in loose, slender, axillary panicles ; fruit whitish. 



Rhus ver'-nix L. [R. vettetiata DC.) Poison Elder. Sumach or Dogwood. — 



Shrub tJ-18 ft. high; leaflets 7-13, entire; the most poisonous species; 

 growing in swamps. 



