390 CALIFORNIA ACADEMY OF SCIENCES. 



11. Arabis FiLiFOhiK^^ Cardamine filifolia, Greene, Pit- 

 tonia, i. 30. — Notwithstanding its close resemblance, in 

 some respects, to our common Cardamine oligosperma, this 

 new insular plant must needs be an Arahis, for its siliques 

 are not only not elastically dehiscent; they are very tardily 

 dehiscent, and so, when ripe, plainly those of the genus to 

 which the species is now referred. 



12. Thelypodium lasiophyllum, Greene, Bull. Torr. 

 Club. xiii. 142. 



13. Sisymbrium vm'i^ATVM=Eri/.mmimijinnatum, Walter, 

 n. Carol. 174 (1788): Sisymhrmm canescens, Nutt. Gen. ii. 

 68 (1818). 



14. Sisymbrium officinale, Scop. Carn. ed. 2, n. 824. — 

 In cultivated lands only. 



15. Nasturtium aquaticum, Tragus, Hist. 82 (1552); 

 DodoniBus, Pempt. 581 (1583); Bauhin, Pinax. 104 (1623); 

 N. officinale, E. Br. Hort, Kew. ed. 2, iv. 110 (1812).— 

 Mouth of streamlet at Prisoner's Harbor. 



16. Brassica nigra, Boiss. — Not widely prevalent. 



17. Capsella divaricata, Walp. Rep. i. 175. — On a low 

 promontory, near the seashore, on the north side of the 

 island; probably adventive, for only one plant was seen. 



18. Capsella Bursa-pastoris, Moench, Meth. 271. 



19. Lepidium nitidum, Nutt. ; Torr. & Gray. Fl. i. 116, 



20. Lepidium Men^ziesii, DC. Syst. ii. 539. 



21. Athysanus pusillus, Greene, Bull. Cal. Acad. i. 72. — 

 Common on the northward slope. 



22. Thysanocarpus gonchuliferus, Greene, Bull. Torr. 

 Club, xiii. 218; Pittonia, i. 31. 



23. Thysanocarpus ramosus. Wholly glabrous and 

 slightly glaucous, a foot high, the stem parted near the 



