126 ANACAKDIACEAE 



10. B. Arkansana Engelm. 12' or less high, 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, S'-IS' high: leaves linear: 

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

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

 June. 



FAMILY 72. CALLITRIOHACEAE Lindl. 



Small herbs with opposite leaves and monoecious or perfect axillary 

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

 pne. Ovary 4-oelled. Styles 2. Fruit compressed, containing four pendu- 

 lous seeds. 



1. CALLITRICHE L. Watee Staewobt. 



With the characters of the family. 



Terrestrial. 1. C. Ausiini. 



Aquatic. 2. (7. heterophylla. 



1. C. Austlni Engelm. Tufted, 6"-30" 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. 

 Locally common. June. 



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

 or linear : bracts present » fruit less than J" 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. B. copallina. 



Leaf raohis not wing margined. 2. S. glabra. 



Leaves 3-foliolate. 

 Fruit gray, glabrous. 3. B. radicans. 



Fruit rerldish, hairy. 



Leaflets pubescent. 4. B. 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 : fruifcreddish, hairy. — Common in dry soil throughout. June- 

 July. 



