524 PLANT LIFE OF ALABAMA. 



Diplotaxis tenuifolia (L.) DC. Syst. 2 : 632. 1821. NARROW-LEAF SAND MUSTARD. 

 Sisymbrium tenuifolium L. Cent. PI. 1 : 18. 1755. Amoen. Aead. 4 : 279. 1788. 

 Gray, Syn. Fl. N. A. 1, pt. 1 : 134. Britt. & Br. 111. Fl. 2 : 120. 

 EUROPE. 



From the same region, and found in abont the same situations as the above. 

 ALABAMA : Less frequent than the last on ballast heaps at Mobile. Perennial. 

 Type locality: " Hab. in Gallia, Italia, Helvetia." 

 Herb. Mohr. 



IODANTHUS Torr. & Gray, Fl. N. A. 1 : 72. 1838. 

 (THELYPODIUM Wats. Index, 73. 1878.) 



A single species, Atlantic North America, 

 lodanthus pinnatifidus (Michx.) Steud. Nomenc. ed. 2, 812. 1841. VIOLET ROCKET. 



Hesperis pinnatifida Michx. Fl. Bor. Am. 2 : 31. 1803. 



lodanthus hesperidoides Torr. & Gray in Gray, Gen. 111. 1 : 134, t. 54. 1848. 



Gray, Man. ed. G, 72; Chap. Fl. 25. Gray, Syn. Fl. N. A. 1, pt. 1: 150. Engl. & 

 Prantl, Nat. Pfl. 3, Abt. 2 : 183. 



Alleghenian to Carolinian area. Western Pennsylvania, Ohio Valley, and Minne- 

 sota, south to Texas and Arkansas. 



ALABAMA : Tennessee Valley. Rich woods. Lawrence County, Moultou. Lander- 

 dale County, Florence (M. C. Wilson). Flowers violet, April, May; fruit ripe in 

 July. Not frequent. Perennial. 



Type locality : " Hab. in humidis sylvarum Tennasse'e." 



Herb. Geol. Surv. Herb. Mohr. 



RORIPA Scop. Fl. Cam. 520. 1760. 

 (NASTURTIUM R. Br. in Ait. Hort. Kew. ed. 2, 4 : 109. 1812. ) 



Fifty species, temperate regions, Northern Hemisphere. North America, 13. 

 Roripa nasturtium (L.) Rusby, Mem. Torr. Club, 3, pt. 3 : 5. 1893. WATKK CKESS. 



Nasturtium officinale R. Br. in Ait. Hort. Kew. ed. 2, 4 : 110. 1812. 



Sisymbrium nasturtium L. Sp. PI. 2 : 657. 1753. 



Ell. Sk. 2 : 145. Gray, Man. ed. 6, 69. Chap. Fl. 25. Wats. Bot. Calif. 1 : 43. Coulter, 

 Contr. Nat. Herb. 2 : 16. Gray, Syn, Fl. N. A. 1, pt. 1 : 146. 



EUROPE, ASIA, SOUTH AMERICA (introduced). 



Alleghenian to Louisianian area. Naturalized and profusely distributed from 

 Nova Scotia and Ontario to the Gulf, west to Texas, Colorado, Utah, and California. 



ALABAMA: Sparingly over the State. Shallow brooks. Mobile County, Spring- 

 hill. Jefferson County (K. A. Smith). Flowers white; April. Perennial. 



Economic uses: The fresh herb, " water cress," is used medicinally and as a salad. 



Type locality : " Hab. in Europa et America septentrionali ad fontes." 



Herb. Geol. Surv. Herb. Mohr. 



Roripa sylvestria (L.) Bess. Enum. 27. 1821. YELLOW CRESS. 



Sisymbrium sylvestre L. Sp. PI. 2 : 675. 1753. 



Nasturtium sylvestre R. Br. in Ait. Hort. Kew. ed. 2, 4 : 110. 1812. 



Gray, Man. ed. 6, 69. Chap. Fl. ed. 3, 24. Gray, Syn. Fl. N. A. 1, pt. 1 : 147. 



EUROPE, ASIA. 



Carolinian and Louisianiau areas. Naturalized from Massachusetts to Virginia, 

 Illinois, and Missouri. 



ALABAMA: Fully established in shallow marshes and muddy ditches. Mobile. 

 Observed for the past fifteen years, constantly spreading. Flowers deep yellow ; 

 April to June. Frequent. Perennial. 



Tvpe locality : '" Hab. in Helvetiae, Germaniae, Galliae ruderatis." 



Herb. Geol. Surv. Herb. Mohr. 



Roripa sessiliflora (Nutt.) A. S. Hitchcock, Spring Fl. Manhat. 18. 1894. 



EARLY FIELD CRESS. 



Nasturtium sessiliflorum Nutt. in Torr. & Gray, Fl. 1: 73. 1838. (Gray, Gen. Illust. 

 1:132, t.53.) 



Gray, Man. ed. 6, 70. Chap. Fl. 24. Coulter, Contr. Nat. Herb. 2 : 17. Gray, Syn. Fl. 

 N.A.i,pt.l:149. 



Carolinian and Louisianian areas. Virginia and Kentucky to Missouri, south from 

 Tennessee to Florida and western Texas. 



