24 CRUCIFER^. 



15. SISYMBBIUM, Linnaeus. 



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



3 to 6 lines long, pedicels spreading 1, 2 



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



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



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



2. S. Incisiixa, Englem. Somewhat glandular: petals 1^ lines long. Montane. 



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



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



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



16. NASTURTIUM, Robt. Brown. 



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



2. N. obtusum, Nutt. Petals minute: pods 1^ to 3 lines long. 



3. N. officinale, R. Br. Aquatic: petals white, l^ to 2 lines long. 



17. VESICARIA, Tournefort. 



1. V. montana, Gr. Pods oblong-ovoid, 2^ 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. TROPIDOCARPUM, Hooker. 

 L T. gracile, Hook. Leaves pinnatiKd: flowers yellow, 3 to 6 lines long. Cal. 



19. SUBULAIilA, Linneeus. 

 1. S. aquatica, L. Flowers minute: pods 1^ lines long. Mono Pass. 



20. ETANFOBDIA, Watson. 

 1. S. Calif omica, Wats. Flowers 3 or 4 lines long on hairy pedicels, purple. 



21. CAPSELIiA, Moench. 



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



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



23. THIiASPI, Linnseus. 



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



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



