134 VIOLACEAE 



than 20-striate. In a ditch near the railroad depot at Atherton. June- 

 July. 



2. BERGIA L. 

 Erect pubescent herbs. 



1. B. Texana (Hook.) Seub. 4 / -12 / high : leaves 6"-8" long, spatu- 

 late, serrate : petals white, scarious, persistent Twice collected on sand- 

 bars along the Missouri River near Courtney. July-October. 



FAMILY 85. CISTACEAE Lindl. 



Herbs with opposite or alternate leaves and regular flowers. Sepals 

 and petals 3 or 5 each. Stamens few-many. Ovary solitary, 1 -several - 

 celled. Ovules stalked. Two outer sepals smaller than the three inner 

 or wanting. 



Petals five, fugacious. 1. HELIANTHEMUM. 



Petals three, persistent. 2. LECHEA. 



1. HELIANTHEMUM Pers. 



Early flowers petaliferous, the later apetalous. Stamens 3-10. Cap- 

 sule 1-celled, few-seeded. 



1. H. majus (L.) B.S.P. FEOSTWEED. l-2 high, hoary-canes- 

 cent : leaves oblong-lanceolate : petaliferous flowers 5-12, their capsules 

 2" in diameter : apetalous flowers numerous, their capsules 1 7/ in di- 

 ameter. Very local in dry soil near Dodson, Eaytown, Greenwood and 

 Grain Valley. May- June. 



2. LECHEA L. PINWEED. 



Petals small and inconspicuous. Stamens 3-12. Stigmas prominent, 

 three. Pods partly 3-celled, 6-seeded. Sterile leafy basal shoots are de- 

 veloped late in the season. 



Leaves oval-oblong. 1. L. villosa. 



Leaves linear. 2. L. tenuifolia. 



1. L. villosa Ell. Tufted, erect, K/-18' high, villous : leaves ovate 

 to oblong-oval. Three miles south of Sni Mills in sandy woods. Rare. 

 June-October. 



2. L. tenuifolia Michx. Tufted and spreading, 4 / -8 / high, appressed- 

 pubescent : leaves all linear : sepals 1-nerved. Locally frequent in sandy 

 soil four miles southeast of Grain Valley, and three miles south of Sni 

 Mills. June-October. 



FAMILY 86. VIOLACEAE DC. 



Herbs with stipulate, usually alternate or basal, leaves, and perfect more 

 or less irregular flowers. Sepals, petals and stamens five each. Ovary 

 1-celled with three parietal placentae. 



Sepals auricled at base. 1. VIOLA. 



Sepals not auricled at base. 2. CUBELIUM. 



