Ll 
472 BRASSICACEAE 
2. Camelina sativa (L.) Crantz. Foliage glabrous or nearly so. Stems erect, 
3-9 dm. tall, simple or branching above: basal leaves spatulate or oblanceolate, undu- 
late, or repand : stem-leaves with sagittate-lanceolate blades 2-7 em. long, acutish, entire, 
sessile, clasping by the auricled bases : pedicels ascending, 1-1.5 cm. long, enlarged at the 
apex: sepals oblong, 2.5-3 mm. long: petals yellowish, nearly twice as long as the sepals : 
silicles pyriform, 6-8 mm. long, somewhat flattened, each tipped with the acute style, the 
sutures margined. 
In fields and waste places, southern British America and the eastern United States. Naturalized 
from Europe. Spring. 
` 
7. RORIPA Scop. 
Aquatic or terrestrial herbs, with erect or creeping stems and glabrous or pubescent 
foliage, the hairs simple. Leaves alternate: blades toothed, lobed or pinnately dissected. 
Flowers perfect, in terminal or axillary racemes. Sepals 4, equal, spreading during anthe- 
sis. Corolla yellow or white: petals 4 (or rarely wanting), usually small, without very 
manifest claws. Stamens 1-6. Ovary sessile: styles stout or slender: stigmas 2-lobed. 
Pods of various lengths, terete or nearly so, rarely didymous, the valves commonly 1-nerved. 
Seeds in 2 rows, turgid. Cotyledons accumbent. [Nasturtium R. Br.] WaTER-CRESS. 
SrURSHUM. 
Corolla white. 
Blades of all leaves similar: sepals 2-2.5 mm, long: pods fully 1 em. long. 1. R. Nasturtium. 
Blades of submersed leaves unlike those of emersed leaves: sepals 3 mm. long: $ 
pods less than 1 em. long. 2. R. Americana. 
Corolla yellow. : 
Annual or perennial from fibrous roots: petals mostly shorter than the sepals. 
Flowers and pods sessile or nearly so. 
Leaf-blades bipinnatifid : style 2 mm. long: pods 4-7 mm. long. 3. R. Walteri. 
Leaf-blades pinnatifid : style almost wanting: pods 3-4 inm. long. 4. R. scssiliflora. 
Flowers and s manifestly pedicelled. 
Stems upright: pedicels 4-8 mm. long. 
Pods subglobose or oval, shorter than the pedicels: stem pubescent. 5. R. hispida. 
Pods linear or narrowly oblong, as long as the pedicels or longer: stem 
glabrous or nearly so. 6 
Stems diffuse: pedicels 2-4 mm. long. 
Pods subglobose, about 2 mm. in diameter. 7 
Pods oblong, 4-8 mm. long. 8 
Perennial by creeping or horizontal stems: petals mostly surpassing the sepals. : 
Leaf-blades pinnatifid : style slender. 9. R. sinuata, 
Leaf-blades pinnately parted: style short and stout. 0. K. sylvestris. 
1. Roripa Nasturtium (L.) Rusby. Perennial, aquatic, glabrous. Stems floating, 
or decumbent and creeping, 1-6 dm. long, simple or branched: leaves alternate; blades 
unequally pinnate, 2-15 em. long; leaf-segments 3-9, irregular, obtuse, the lateral ones 
sometimes much reduced, the terminal one larger, usually truncate or cordate at the base: 
racemes elongating in fruit: pedicels finally spreading, 5-15 mm. long: sepals oblong, 
2-2.5 mm. long, obtuse : petals white, about twice as long as the sepals: pods linear, 1-2.5 
em. long, nearly terete, more or less strongly curved upward. [Nasturtium officinale R. Br.] 
In swampy places or in brooks, Nova Scotia to Idaho, Georgia and Texas. Naturalized from 
Europe. Spring to fall. WATER-CRESS. 
‘2. Roripa Americana (A. Gray) Britton. Perennial, aquatic, glabrous or nearly so. 
Stems 3-8 dm. long, zigzag, branching above: leaves alternate ; submersed with finely pin- 
nately dissected blades, readily deciduous ; emersed, oblong-elliptic or linear-oblong, 3-10 
em. long, undulate, serrate or pinnatifid : pedicels spreading, 5-15 mm. long, slender : sepals 
oblong, 3 mm. long, obtuse: petals white, about twice as long as the sepals: pods oblong 
or oval-oblong, 5-6 mm. long, nearly 1-celled. [Nasturtium lacustre A. Gray. ] 
In ponds or in sluggish streams, Quebec to Minnesota, Florida and Louisiana. Summer. 
3. Roripa Wálteri (Ell.) Mohr. Annual or biennial, glabrous. Stems more or less 
diffusely branched at the base ; branches ascending or spreading, 1-4 dm. long, branched : 
leaves basal and cauline, 2-10 em. long ; blades bipinnatifid, the segments of various shapes : 
racemes elongating in fruit: pedicels spreading or ascending, 1-5 mm. long: sepals about 
1 mm. long: petals slightly longer than the sepals : pods oblong, 8-14 mm, long, slightly 
curved, erect or ascending. [Nasturtium tanacetifolium (Walt. ) Hook. : 
d In low ground and ditches, South Carolina to Florida, the Indian Territory, Texas and Mexico. 
pring. 
'4. Roripa sessiliflora (Nutt.) A. S. Hitchcock. Annual or biennial, glabrous. 
Stems erect, 2-6 dm. tall, branching above: leaves alternate ; blades lanceolate or ovate 
to obovate or oblanceolate, 3-15 em. long, obtuse, coarsely toothed, lobed or pinnatifid, 
the lower ones petioled, the upper often sessile: racemes elongating : pedicels mostly 1-2 
5. R. palustris. 
. R. sphaerocarpa. 
. R. obtusa. 
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