14 CRUCiFERa;. 



IS. SISYMEBIUM, Linnaus. 



Leares 1-2-pmnate; segments usually pinnatifid: dense racemes: pods acute at both ends, 



3 to 6 lines long, pedicels spreading 1, 3 



Leaves pinnatifid or entire: pods 10 to 18 lines long 3, 4 



Leaves runcinate, 3 to 6 in. long: divaricately branched 5 



1. S. canescens, Nutt. Stems (as in all the speoiea) branching: seeds in 2 rows. 



2. S. incisum, Englem. Somewhat glandular: petals IJ lines long. Montane. 



3. S. junceum, Bieb. Glaucous: petals 3 lines long. Oregon. 



4. S. aoutangulum, DC. Hairy: leaves runcinate, 2 to 6 in. long. 



5. S. officinale, Soop. Similar: pod 6 lines long, tapering to a point. 



16. NASTTJRTIUM, Robt. Brown. 



1. N. curvisiliqua, Nutt. Leaves pinnatifid: petals but little exserted. 



2. N. obtusum, Nutt. Petals minute: pods IJ to 3 lines long. 



3. N. officinale, K. Br. Aquatic: petals white, 1^ to 2 lines long. 



17. VESICABIA, Toumefort. 



1. v. montana, Gr. Pods oblong-ovoid, 2 J lines long. N. Cal. 



2. V. Klngii, Wats. Leaves 2 to 6 lines long: pods hairy, ovoid. 



3. V. occidentalis. Flowers 4 lines long: pods globose. N. Cal. 



18. TEOPIDOCABPUM, Hooker. 

 h T. facile, Hook. Leaves pinnatifid: flowers yellow, 3 to 6 lines long. OaL 



19. SUBULARIA, Linnaeus. 

 L S, aquatica, L. Flowers minute: pods IJ lines long. Mono Pass. 



20. STANFOEDIA, Watson. 

 1. S. Califomioa, Wats. Flowers 3 or 4 lines long on hairy pedicels, purpla, 



21. CAPSELLA, Moench. 



1. C. divaricata, Walp. Very slender, diffuse: pods elliptic oblong. 



2. C. Bxirsa-pastoris, Moench. Pods cuneate-obcordate. Everywhere, 



22. THLASPI, Linnaeus. 



1. T. alpestre, L. Pods obovate to cuneate-oblong, not acute, beaked. 



2. T. Oalifomicum, Watson. Pods oblanceolate, acute, 4 or 5 lines long. N. CaL 



