This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol2", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Brachylobus hispidus Desv. Journ. Bot. 3: 183. 1814. Nasturtium hispidum DC. Syst. 2: 201. 1821. Nasturtium palustre var. hispidum A. Gray, Man. Ed. 2, 30. 1856. Roripa hispida Britton, Mem. Torr. Club 5: 169. 1894. Radicula hispida Britton, Torreya 6: 30. 1906. R. palustris hispida Robinson, Rhodora 10: 32. 1908.
Resembling the preceding species, but often stouter, sometimes 4o high and with lower leaves 10' long, the stem, branches, petioles and veins of the lower surfaces of the_ leaves hirsute with spreading hairs. Leaves lyrate-pinnatifid; pedicels slender, spreading, about 3" long, longer than the globose or ovoid pod, which is 1-2 times as long as thick.
In wet places, New Brunswick to Alaska, British Columbia, Florida and New Mexico. Europe. Summer.
Nasturtium sessiliflorum Nutt.; T. & G. Fl. N. A. I: 73. 1838.
Roripa sessiliflora A. S. Hitchcock, Spring Fl. Manhattan 18. 1894.
Radicula sessiliflora Greene, Leaflets 1: 113. 1905.
Annual or biennial, erect, glabrous, 8-20' high, sparingly branched above, the branches ascending. Leaves petioled, the lower 3'-4' long, obovate or oblong, obtuse, crenate, lobed or pinnatifid, with obtuse lobes; flowers yellow, 1" broad, nearly sessile; pods very slightly pedicelled, spreading or ascending, 3"-6" long, 1" broad, narrowly oblong; style very short; seeds minute, mostly in 2 rows in each cell.
Wet grounds, Virginia to Illinois, Iowa, Nebraska, Arkansas, Florida and Texas. April-June.