90 CRUCIFER^. Hesperis. 



ed ; the terminal one much larger and somewhat orbicular. Racemes 4-10- 

 flowered. Flowers in the young plant, or in dwarf specimens, on long 

 erect naked peduncles or scapes ; in the advanced s.tate on racemes which 

 terminate the short assurgent branches. Pedi-cels without bracts, an inch 

 or more in length, filiform, spreading and curved upward. Sepals rather 

 loose, oblong, obtuse, tinged with purple. Petals golden yellow, tapering into 

 a long cuneate base. Filaments slender : anthers oblong. Style short, but 

 conspicuous. SUique rather more than an inch long and nearly two lines 

 in breadth, slightly torulose, rather convex : septum very thin and transpa- 

 rent. Seeds 4-5 in each cell, suspended on short rigid funiculi, approximar 

 ted so that their broad membranaceous margins somewhat overlap. Embryo 

 nearly straight, from the earliest to the most advanced state. Radicle pomt- 

 ing upward, at first inclined from the hilum, but afterwards gradually approxi- 

 mating towards it. 



2. L. Michauxii (Torr.) : style almost none ; radicle oblique. Torr. ! 

 I.e. Cardamine uniflora, Michx: ! fl. 2. p. 29; PursJi, f. 2. p. 439; DC. 

 syst. 2. p. 251. 



On rocks about Knoxville, Tennessee, Michaux ! and on wet rocks, Ken- 

 tucky, Short .'—Greatly resembling the preceding species, but easily dis- 

 tinguished by its nearly sessile stigma. The difference in the direction of 

 the^'radicle seems also to be constant. Michaux states that the peduncles are 

 radical and one-flowered, but the specimens in his herbarium are caulescent; 

 the racemes terminating short assurgent branches, and the pedicels being 

 greatly elongated, so as to resemble scapes. 



Tribe II. SISYMBRE^. DC. 



Silique longitudinally dehiscent ; valves nearly plane, or somewhat 

 terete and carinate : septum linear. Cotyledons plane, incumbent 

 (o|| ), contrary to (i. e. with their edges towards) the septum. Seeds 

 not bordered. 



12. HESPERIS. Linn. ; DC. syst. 2. p. UQ. 



Silique nearly terete, or 4-sided and somewhat compressed. Stigmas 2, 

 erect connivent. Inner sepals saccate at the base. Seeds somewhat 3-sided. 

 Stamena toothless. — Rocket. 



1. H. matronalis (Linn.): stem erect, nearly simple; leaves ovate-lan- 

 ceolate, toothed ; pedicels as long as the calyx ; petals obovate, siliques gla- 

 brous, torose, erect, margin not thickened (flowers white or rose-color). DC. 

 prodr. l.p. 189; Hook.Jl. Bar.- Am. 1. p. 59. 



. Shores of Lake Huron, Dr. Todd, (fide JEToo/r.)— Doubdess introduced. 



2. H. minima : pubescent with appressed 2-parted hairs ; leaves linear- 

 lanceolate, attenuate at the base ; siliques numerous, erect, compressed, pu- 

 bescent ; stem erect, simple. Hook.—U. pygmaea, Hook. fl. Bor.-Am. 1. p. 

 60. t. 19. (not of Delile) Cheiranthus pygmseus, Adams; DC. prodr. 1. p. 

 137, fide Hook. . 



Arctic America, Kotzebue's Sound. — (I) Root fusiform. Stem in fruit a 

 span high, a little flexuous. Leaves mostly radical, entire or sinuate-toothed. 

 Corymb many-flowered, racemose in fruit. Petals large, obovate, purple. 



