1906] House,— Violets of the District of Columbia 119 



22. V. scABRiuscuLA Schwein. Along the River bottoms of the 

 Potomac River above Washington. 



23. V. PUBESCENS Ait. Great Falls, Md., Fairfax Co. and Blue- 

 mont, Va. 



24. V. CONSPERSA Reichenb. {V. Muhlenhergii Torr., V. lahra- 

 dorica Authors, probably not of Schrank.) Rock Creek Park and 

 toward Great Falls. 



25. V. STRIATA Ait. Common along the River bottoms and 

 Canal banks above the city of Washington. 



26. V. Rafinesquii Greene. 



In addition to this list, the following forms have been described 

 from this region, the exact status of which I have not had the oppor- 

 tunity to determine: V. laetecaerulea Greene, V. filicetorum var. 

 parthenica Greene, V. emarginata var. simulata Greene, and V. 

 fontana Greene. 



The recognized hybrid forms are best given in alphabetical order 

 as follows. All specimens cited by number or date unless otherwise 

 stated were collected by the writer. 



Viola afl&nis X papilionacea hyb. nov. At Woodridge, D. C, 

 on a moist wooded hillside is a large colony of V. affinis (No. 651), 

 and at the base of the hill in a meadow, V. papilionacea is abundant. 

 When first seen (May 3d) there was noticed an abundance of what 

 seemed to be a darker and broader-leafed form of V. affinis, growing 

 lower down on the hillside than V. affinis. The intermediate char- 

 acters of the leaves and flowers indicated its hybrid origin which 

 specimens in fruit gathered later (June 15th) showed to be true. 

 The abortive capsules were distinctly pubescent and the plant much 

 larger than typical V. affinis. — Woodridge, D. C, May 3d, 1905 

 (No. 652) and June 15, 1905. Type in herb. H. D. House. 



Viola affinis X sagittata Brainerd, Rhodora 8: 55. 1906. — 

 Patuxent, Md. June 4, 1905 (No. 972, type). 



Viola affinis X villosa Brainerd, Rhodora 8: 56. 1906. — 

 Rock Creek Park, May 13, 1905 (Nos. 702, 705, 710); Glen Echo, 

 May 17, 1905 (No. 733); Kensington, June 11, 1905 (No. 1003); 

 Glen Carlyn, Va., June 25, 1905 (No. 1053, in part). 



Viola Brittoniana X cucullata House, Bull. Torrey Club 32: 

 255, pi. 17. 1905. V. riofabilis Bicknell, Torreya 4: 131. V. 

 cucullata X sepfemloba Brainerd, 1. c. 52. — Riverdale, Md., June 8, 

 1905 (No. 988, in part). 



