340 Plants of San Krancisco. [zok 



28. Nasturtium officmale Brown. Common in streams and 

 marshy places. All the year. " Water Cress." 



In the marshy ground about the estuary of Visitacion Valley it 

 grows supported by bushes and other plants to a height of five feet. 

 Dr. Behr has recorded^ the fact that he did not find it about San 

 Francisco in the earlier years of his residence. 



29. Capsella Biirsa-pastoris (L. spec. 903). Common every- 

 where. January — April. *' Shepherd's Purse.'' 



30. Lepidium nitidum Nutt. T. 5^ G* Fl. i, 116. There 

 seems to be two vernal generations of diis plant. The first (in Janu- 

 ary and February) is strict, nearly simple, not more and usually 

 much less than four inches in height. The succeeding generation 

 is of very much greater size and more spreading. Common every- 

 where. * ' Pepper Grass." 



31. Lepidium Menziesii. DC. Syst. ii, 539. Low, often 



prostrate and forming round mats. South San Francisco, Mis- 

 sion Hills, Islais Creek. January— May. 



32. Se7iebiera didyma (L. Mant. 92). About the base of Tele- 

 graph Hill, sidew^alks in the western part of the city, and hanging 

 over the cliffs near Sutro Heights. January — August. **Wart 

 Cress." 



33. Senebiera coronopus (L. spec. 904). About the base of Tele- 

 graph Hill, not so common as the last. 



34- Thysanocarpus curvipes Hook. Fl. i, 69, t. 18. Mission 

 and South San Francisco Hills. February— May. " Lace Pod." 



35. Thysanocarpus pusillus Hook. Ic. PI. t. 43. Sunset 



Heights and hills of South San Francisco. March— April. 



36. Raphanus sativus L. spec. 935. Very abundant in old fields, 

 ofien completely filling them with various tints of white, pink and 



cream color. March— May. "Radish." 



37. Cakile Americana Nutt. Gen. ii, 62. About the shore spar- 

 ingly from Black Point to the outlet of Lake Merced, and very 



abundant a short distance south of it. June— September. "Sea 

 Rocket." 



Zoe, ii. 4. 



