126 ANACARDIACEAE 



10. E. Arkansana Engelni. 12' or less bij^h, erect, glabrous : leaves 

 oblong-spatulate, sessile, those of the inflorescence opposite and ovate : 

 involucral glands not appendaged : seeds faintly reticulated. — Barrens 

 near Lee's Summit and Dodson. Local. May-June. 



11. E. Cyparissias L. Glabrous perennial, 6^-12' high: leaves linear: 

 bracts heart-shaped : involucral glands crescent-shaped, not appendaged: 

 seeds smooth. — Persistent after cultivation near Wayne City. May- 

 June. 



Family 72. CALLITRICHACEAE Lindl. 



Small herbs with opposite leaves and monoecious or perfect axillary 

 flowers with two bracts or bractless. Sepals and petals absent. Stamen 

 one. Ovary 4-celled. Styles 2. Fruit compressed, containing four pendu- 

 lous seeds. 



1. CALLITRICHE L. Water Starwoet. 



With the characters of the family. 



Terrestrial. 1. C. Ausiini. 



Aquatic. 2. C heterophylla. 



1. C. Austini Engelm. Tufted, G^^-SiV^ long : leaves spatulate, 3- 

 nerved: bracts absent : fruit Y^ long, deeply notched at both ends. — 

 In moist upland woods, Little Blue Tank, Lee's Summit, Grain Valley. 

 Locallj' common. June. 



2. C. heterophylla Pursh. 2''-10'' long : leaves obovate and 3-nerved 

 or linear : bracts present : fruit less than V^ long, and as broad, obovate, 

 rounded on the face, shorter than the styles. — In ponds along the Little 

 Blue from Little Blue Tank to Atherton. Local. May-July. 



Family 73. ANACARDIACEAE Lindl. 

 Shrubs or vines with milky juice, alternate leaves and polygamo-dioe- 

 cious or perfect regular flowers. Sepals, petals and stamens 3-7 each. 

 Ovary 1-celled, 1-ovuled. Styles three. 



1. RHUS L. 

 Flowers polygamous in panicles. Sepals, petals and stamens five each. 

 Styles terminal. Fruit symmetrical. 



Leaves pinnately many-foliolate. 



Leaf rachis wing-margined. 1. R. copallina. 



Leaf rachis not wing margined. 2. E. glabra. 



Leaves 3-foliolate. 



Fruit gray, glabrous. 3. R. radicans. 



Fruit rc'ldish, hairy. 



Leaflets pubescent. 4. R. aromatica. 



Leaflets glabrous. 5. R. (rilobata. 



1. R. copalUna L. Black Sumac. 5°-30° high: leaflets 9-21, 

 ovate-lanceolate, entire, downy : flowers greenish in dense terminal 

 panicles : fruit reddish, hairy. — Common in dry soil throughout. June- 

 Julv. 



