176 PHRYMACEAE 



1. M. Louisiana Mill. UNICORN PLANT. 6'-2 high : leaves heart- 

 shaped, undulate : flowers l / -2 / long. Occasionally adventized in fields 

 and waste places, Hickman's Mills, Dodson, Courtney and Independence. 

 May-September. 



FAMILY 115. ACANTHACEAE J. St. Hil. 



Herbs with opposite, simple, non-stipulate leaves and perfect, more or 

 less irregular flowers. Divisions of calyx and corolla 4-5 each. Stamens 

 four, didynamous, or only two. Ovary superior, 2-celled. Fruit a few- 

 seeded capsule, the seeds borne on curved projections of the placentae. 

 Capsule elastically 2-valved. 



Corolla nearly regular. 1. RUELLIA. 



Corolla strongly 2-lipped. 2. DIANTHKRA. 



1. RUELLIA L. WILD PETUNIA. 



Perennials with showy purplish axillary flowers, a funnel-form corolla 

 with a large spreading border, 4 stamens and a 6-20-seeded capsule. 



Plant glabrous or nearly so. 1. R. strepens. 



Plant strongly hirsute. 2. R. ciliosa. 



1. R. strepens L. l-3 high : leaves ovate, petioled : corolla l'-2' 

 long : later flowers often cleistogamous : calyx segments linear-lanceolate, 

 about the length of the capsule. Common in moist woods along the 

 Missouri River : occasional elsewhere. May-August. 



2. R. ciliosa Pursh. 6 / -18 / high : leaves oblong-ovate, sessile : flower s 

 resembling those of the last : calyx segments narrowly linear, much 

 exceeding the capsule. Common in dry ground throughout. May- 

 August. 



2. DIANTHBRA L. 



Ours is a perennial herb with flowers in axillary peduncled spikes. 

 Upper lip of corolla notched, the lower 3-cleft. Stamens two. Ovary 

 4 seeded. 



1. D. Americana L. WATER WILLOW. l-3 high, glabrous : leaves 

 linear-lanceolate, entire: corolla violet, less than 6 X/ long. Locally com- 

 mon in running water from Brush Creek to Little Blue Tank and south- 

 ward. May-August. 



FAMILY 116. PHRYMACEAE Schauer. 



Herbs with opposite leaves and perfect irregular flowers in loosely 

 flowered spikes. Calyx 2-lipped, the upper lip with three setaceous teeth, 

 the lower with two much shorter teeth. Corolla 2-lipped, the tube cylin- 

 dric, the upper lip emarginate, erect, the lower 3-lobed, spreading. Sta- 

 mens four, didynamous. Ovary superior, 1-celled, 1-ovuled. Calyx 

 abruptly reflexed against the axis of the spike in fruit. 



1. PHRYMA L. 



Characters of the family. 



