TcRRiTis. CRUCIFER^. 53 



3. TURRITIS. Dill. ; Endl. gen. 'iSbS. tower mustard. 



[Named from turns, a tower ; from the pyramidal form of the plant.] 



Silique linear ; the valves plane. Seeds in a double series in each cell. Flowers white or 

 rose-color. 



1. TuRRiTis STRicTA, Graham. Straight Tmoer Mustard. 



Plant glabrous ; stem straight and erect ; stem leaves linear-lanceolate, clasping and sagit- 

 tate, sparingly toothed ; radical ones petioled, narrowly spatulate, remotely and sharply 

 denticulate; siliques linear, elongated, and (like the flowers) strictly erect, pointed with the 

 very short style. — Graham in Edin. new phil. jour. (1829), p. 7; Hook. Jl. Bor.-Am. 1. 

 p. 40 ; Torr. §■ Gr. jl. N. Am. 1. p. 79. T. glabra, ^.? Torr. ^ Gr. I. c. p. 78. 



Root biennial. Stem 1-2 feet high, terete, simple. Leaves about an inch long ; the 

 cauline ones erect. Flowers in a terminal raceme, which is elongated in front. Pedicels of 

 the fruit 3-5 lines long. Silicle 2-3 inches long, and scarcely more than half a line wide. 

 Seeds imperfectly two-rowed when young, but at maturity nearly as broad as the dissepiment, 

 distinctly winged ; even then, however, the double row can be perceived : funicle slender. 



On rocks, Walertown, Jefferson county, where it was first found by Dr. Crawe. Lebanon, 

 Chenango county (Dr. Douglass). May. 



This plant was described as a variety of T. glabra in the Flora of N. America, but we had 

 not then seen New- York specimens in fruit, neither had we an opportunity of comparing it 

 with T. striata of Graham. As intimated in the Supplement to the Flora (p. 666), there can 

 now be little doubt of its being Graham's plant. 



4. ARABIS. Linn. ; Endl. gen. 4854. wall cress. 



[Etymology uncertain ; but the name is supposed to allude to the Arabic origin of the original species of the genus.] 



Silique linear, plane : valves 1 -nerved in the middle. Seeds in a single series in each cell, 

 oval or orbicular, compressed. Flowers white, rarely rose-color. 



» Seeds immarginate, or ur'dh only a nairow margin. 



1. Arabis hirsuta. Scop. Hairy Wall Cress. 



Stem erect ; leaves toothed or somewhat entire, and (like the stem) hirsute with a branched 

 pubescence ; radical ones oblong-ovate, petioled or sessile ; cauline ones oblong or lanceolate, 

 Bomewhat clasping, mostly auriclcd at the base, or somewhat sagittate ; siliques numerous, 

 erect.— DC. prodr. 1 . p. 144 ; Hook. fl. Bor.-Am. 1 . p. 42 ; Darlingt. fl. Vest. p. 382 ; Torr. 

 4" Or. jl. N. Am. 1. p. 80. A. sagittata, DC. prodr. 1. p. 143. Turritis hirsuta, Linn.; 

 Wtlld. sp. 3. p. 543. 



