126 ANACARDIACEAE 



10. E. Arkansana Engelm. 12' or less high, erect, glabrous : leaves 

 ohlong-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 STARWORT. 



With the characters of the family. 



Terrestrial. 1. C. Austini. 



Aquatic. 2. <7. heterophylla. 



1. C. Austini Engelm. Tufted, S^-SO" long : leaves spatulate, 3- 

 nerved: bracts absent : fruit \" long, deeply notched at both ends. 

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

 Locally common. June. 



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

 or linear : bracts present : fruit less than \" 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. gldbra. 



Leaves 3-foliolate. 



Fruit gray, glabrous. 3. E. radicans. 



Fruit reddish, hairy. 



Leaflets pubescent. 4. E. aromatica. 



Leaflets glabrous. 5. B. trilobata. 



1. R. copallina 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- 

 July. 



