Vor. II.] MUSTARD FAMILY. 123 
16. IODANTHUS 7. & G.; A. Gray, Man. 32. 1848. 
A glabrous erect perennial herb, with dentate leaves auricled at the base, or the lower and 
basal ones lyrate-pinnatifid, and violet or white flowers in panicled racemes. Sepals much 
shorter than the petals, the inner ones slightly gibbous at the base. Petals long-clawed. 
Style stout; stigma subcapitate. Silique linear-cylindric, somewhat constricted between the 
seeds. Seeds oblong, rounded, in 1 row in each cell. Cotyledons accumbent. [Greek, 
violet-colored flower. } 
A monotypic genus of southeastern North America. 
1. Iodanthus pinnatifidus (Michx.) Steud. JIodanthus. Purple or False 
Rocket. (Fig. 1712.) 
Hesperis (2?) pinnatifida Michx. FI. Bor. _q- 
Am. 2:31. 1803. re a 
Todanthus ester iaesias 8 Gs: A. OR 
Gray, Gen. Ill. 1:134. 1848. gs 
Thely podium pinnatiidum S. Wats. Bot. as 
King’s Exp. 25. _ 1871 1 
Lodanthus PimAaiifidue ‘Steud. Nomencl. 
Ed. 2, 812. 1841. 
Glabrous, stem slender, 1°-3° high, 
branching above. Lower leaves ovate 
or oblong (occasionally cordate), 2/— 
8’ long, dentate, tapering into a mar- 
gined petiole which is clasping and 
auriculate at the base, the lower part 
of the blade often pinnatifid into 2-6 
pairs of small oblong segments; stem- 
leaves similar or merely dentate, nar- 
rower, sometimes ovate-lanceolate, the 
upper nearly sessile; flowers numerous, 
3/’-4’’ broad; pedicels spreading, 2//— 
3’’ long in fruit; pods linear, 1/-114’ 
long, 14’’ wide, spreading or ascend- 
ing; style stout, 1/’ long. 
On river banks, western Pennsylvania 
to Minnesota, south to Kentucky, Louisi- 
ana and Texas. May-June. 
17. RORIPA* Scop. Fl. Carn. 520. 1760. 
[NasturTIUuM R. Br. in Ait. Hort. Kew. Ed. 2, 4: 109. 1812.] 
Branching herbs, with simple or pinnate lobed dissected or rarely entire leaves, and yel- 
low or white flowers. Sepals spreading. Stamens 1-6. Pods short or elongated, terete or 
nearlyso. Stipenone. Valves generally I-nerved. Styleshortorslender. Stigma 2-lobed 
or nearly entire. Seeds turgid, minute, in 2 rows in each cell (very rarely in I row). 
Cotyledons accumbent. [Name unexplained. ] 
About 25 species, of wide geographic distribution, most abundant in the north temperate zone. 
Besides the following, there are about 5 other North American species, natives of the southern and 
western parts of the continent. The white-flowered species perhaps represent different generic types. 
Flowers yellow. 
Flowers and pods distinctly pedicelled. 
Plants perennial by creeping or subterranean branches. 
Leaves pinnately divided; style very short; naturalized European species. 
1. R. sylvestris. 
Leaves pinnatifid; style slender; native western species. 2. R. sinuata, 
Plants annual or perennial, with fibrous roots, 
Pods 1’'-5'' long, peealgue 
Fruiting pedicels 1’ long; s rin diffuse. 
Pods linear to meee ee ' long. 3. R. obtusa. 
Pods subglobose, aBeae rt rin diameter. 4. R. sphaérocarpa. 
Fruiting pedicels 2''-4'’ long; stem erect. 
Stem nearly or quite glabrous; pods linear or linear-oblong. 5. R. palustris. 
,Stem hispid-pubescent; pods globose or oval. 6. R. hispida. 
Pods 4''-7"' long, strongly curved upward. 7. R. curvisiliqua. 
Flowers and pods very nearly sessile. 8. R. sessilifiora. 
Flowers white. 
Leaves pinnately divided; pods linear. 9g. R. Nasturtium. 
Leaves simple or the lower pinnatifid; pods oblong or globose. 
Terrestrial, tall; leaves crenate, or the lower lobed or pinnatifid. 10. R. Armoracia. 
Aquatic; immersed leaves finely dissected. 11. R. Americana. 
* Originally spelled Rorippa, but corrected to this form by Adanson in 1763. 
