24 CRUCIFERZ. 
15. SISYMBRIUM, Linnzus. 
Leaves 1-2-pinnate; segments usually pinnatifid: dense racemes: pods acute at both ends, 
3 to 6 lines long, pedicels spreading. ............00.0.ceeeeeeeee ativan enweite 1, 2 
Leaves pinnatifid or entire: pods 10 to 18 lines long.......... eee ee xgeeaecaies 3,4 
Leaves runcinate, 3 to 6 in. long: divaricately branched............--..-. ae ercidiaiianwians & 
1. 8S. canescens, Nutt. Stems (as in all the species) branching: seeds in 2 rows. 
2, S. incisum, Englem. Somewhat glandular: petals 14 lines long. Montane. 
3. S. junceum, Bieb. Glaucous: petals 3 lines long. Oregon. 
4. S. acutangulum, DC. Hairy: leaves runcinate, 2 to 6 in. long. 
5. 5. 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, 
N. obtusum, Nutt. Petals minute: pods 14 to 3 lines long. 
3. N. officinale, R. Br. Aquatic: petals white, 14 to 2 lines long. 
17. VESICARIA, Tournefort. 
1, V. montana, Gr. Pods oblong-ovoid, 24 lines long. N. Cal. 
2. V. Kingii, Wats. Leaves 2 to 6 lines long: pods hairy, ovoid. 
3. V. occidentalis. Flowers 4 lines long: pods globose. N. Cal. 
18, TROPIDOCARPUM, Hooker. 
1 T. gracile, Hook. Leaves pinnatifid: flowers yellow, 3 to 6 lines long. Cal 
19, SUBULARIA, Linnezus. 
1. 8. aquatica, L. Flowers minute: pods 14 lines long. Mono Pass, 
20. STANFORDIA, Watson. 
1. 8. Californica, Wats. Flowers 3 or 4 lines long on hairy pedicels, purple, 
21. CAPSELLA, Moench. 
lL ¢C. divaricata, Walp. Very slender, diffuse: pods elliptic oblong. 
o &€ Bursa-pastoris, Moench. Pods cuneate-obcordate, Everywhere, 
22, THLASPI, Linnezus. 
1, T. alpestre, L. Pods obovate to cuneate-oblong, not acute, beaked. 
2. T. Californicum, Watson. Pods oblanceolate, acute, 4 or 5 lines long. N. Cal 
