TuRRiTis. XIII. CRUCIFERiE. 165 



1. N. OFFICINALE. R.Br. (SisjTnbriumNast. I/i??w.) English Water Cress. 

 Jjvs. pinnate ; Ifts. ovate, subcordate, rcpand ; pet. white, lonp^er than the 



calyx.— 7]. Brooks and ponds. Stems decumbent, If lon^', thick, with axillary 

 branches. Leaves olli— 7 leaflets; leaflets bruad, often cordate, rather acute, 

 obtuselv toothed, terminal one largest. Flowers corymbed. Siliques less than 

 1' long." Jn. — It is beginning to be cultivated in the vicinity of our cities as a 

 salad. ^:J: 



2. N. AMPiiiBiUM. R. Br. (Sisymbrium. Linn.) Amphilrimis Wakr Cress. 

 Lvs. oblong-lanceolate, pinnatifid or serrate; rt. fibrous ;77c^. longer than 



the calyx; s/Z/y^/^ elliptical, acute at ba.se, tipped with the mucronate style.— 

 % Banks of the Mohawk, Dr. RcUins. Rare. Stem 1—21 high, furrowed. 

 Leaves variable, immer.sed ones pinnatifid or pectinate, upper ohes serrate. 

 FloAvers yellow, minute, in a long, dense raceme. Silique half as long as the 

 spreading or reflexed peduncle, pointed with the short style. Jn. Jl. 



3. N. PALUSTRE. DC. Marsh Water Cress. 



Lvs. pinnately lobed, amplexicaul, lobes confluent, dentate, smooth ; rt. 

 fusiform ; pet. as long as the sepals ; silique spreading, turgid, obtuse at each 

 end.— 21- In wet places. Stem 1— 2f high, erect, branched above. Leaves '2r—6 

 long, all more or less pinnatifid, smooth, except a few ciliae at base. Flowers 

 numerous, minute, yellow. Silique 3—4" long, on pedicels of equal length. 

 Jn. — Aug. 



4. N. HispiDUM. DC. (Si.symbrium. Pairet.) Hispid Water Cress. 



St. villous ; lvs. somewhat villous, runcinate-pinnatifid, lobes rather ob- 

 tusely dentate ; siliques (rather silicles) ovate, tumid, pointed with the style, 

 scarcely more than half as long as the pedicels; pet. scarcely as long as the 

 calvx.— 1|. Banks of streams, Walpole, N. H., Conn, to Penn. Stem angular, 

 branched, 1— 3f high, with many paniculate racemes above. Leaves 6—b 

 long. Flowers minute, yellow. Silicles 1" long, on pedicels 2—3" long and 

 somewhat spreading. 



5. N. NATANS. DC. /?. Americamim. Gray. Floating Water Cress. 

 Emersed lvs. serrate, oblong-linear, undivided, immersed ones doubly 



pinnatifid, with capillary segments ; pet. tw^ce as long as the calyx ; siliqves 

 obovate, twice as long as the style.— 7|. In water. Can. and U. S. Stem long, 

 submerged. Flowers white, middle size. Jl. 



6. N. SYLVESTRE. (Sisvmbrium vulgare. Pers.) Creeping Water Cress. 

 Lvs. pinnately divided, segments lanceolate, incisely senate-, pet. longer 



than the calyx ; siliqvcs oblong, torulose ; sty. very short.— Banks ot the Dela- 

 ware near Philadelphia. Nuttall. ^ 



13. BARBAREA. R. Br. 



In honor of St. Barbara, who discovered (what no one has since perceived) its medicinal virtues. 



Sepals erect, subequal at base : silique columnar, 2— 4-cornered : 

 valves concave-carinate ; seeds in a single series ; 0=. — Lvs. lyrately 

 'pinnatifid. Fls. yellow. 



B. VULGARIS. R. Br. (En'simum Barbarea. Linn.) Winter Cress. _ 

 Lnver lvs. lyrate, the terminal lobe roundish, iipper ones obovate, pin- 

 natifid at base, crenate or repand-dcntate ; siliques obscurely 4-cornered.— ^4 In 

 old fields, also brook-sides, Northern States, W. to Oregon, common. Whole 

 plant glabrous. Stem furrowed, 1— 2f high, branching above. Leaves 1— ^^— ^ 

 lon^, dark green, shining, on clasping petioles, the terminal lobe 1— li diam., 

 upper ones sessile, all with obtuse teeth. Flowers on pedicels \' long, m ter- 

 minal racemes. Siliques slender, f ' long, curved upwards. May, Jn. 



14. TURRIT IS. Dillon. 



Lat. ivrritis, turreted ; from the pyramidal form of the plant. 



Sepals erect, converging ; petals erect ; silique long, linear, 2-edged ; 

 valves plane ; seeds in a double series, 0=. — Fls. cyanic. 



