20 



CRUCIFERJi:. 



tapering from within the broad sinus to a petiole % in. long: fl. white: 

 pods slender-beaked. In Weldon Canon of the Vaca Mountains, Solano 

 Co. March, April. Je.pson. 



9. NASTURTIUM, Bauhin. Perennials with lyrately compound or 

 simple and pinnatifid or undivided leaves. Flowers white. Sepals 

 erect. Petals unguiculate. Pods short, turgid, little compressed, nerve- 

 less. Seeds small, rounded, somewhat flattened, impressed punctate. 



1. N. OFFICINALE, E. Br. (WATERGEESS). Stems rooting at the de- 

 cumbent base, the branches ^5 ft. long, stoutish, hollow; roots all 

 fibrous; leaves pinnate, leaflets rounded or elongated, the terminal one 

 largest: pods ^ in. long or more, acute at each end, equalling the 

 pedicels: style short, thick. Plentiful in sluggish streamlets, and cool 

 springy places. 



2. N. ARMORAOIA, Fries (HORSERADISH). Erect from a stout perpen- 

 dicular perennial root, 2 4 ft. high: earlier radical leaves pinnatitid; 

 later ones very large, not cleft, crenate: pods (seldom formed) ellipsoid 

 or subglobular: style very short. Escaped from cultivation. 



10. RORIPA, Gesner. (FALSE CRESS). Annuals or biennials, com- 

 monly referred to Nasturtium, but the flowers yellow, the sepals greenish- 

 yellow, ascending or spreading, the petals only short-unguiculate and 

 ascending. 



1. R. pal list ris (Leyss.). Erect, stoutish, 13 ft. high, branching 

 above, glabrous: leaves oblong-lanceolate, coarsely and irregularly 

 toothed or pinnatifid, 26 in. long: fl. 1 line long: pods linear-oblong, 

 3 5 lines long, on slender pedicels. Margins of ponds; Oakland Hills; 

 and a rank form in marshes of Sonoma Co. 



2. R. lyrata (Nutt.). Branching from the base, the branches decum- 

 bent or ascending, seldom a foot long, glabrous or sparsely hispidulous: 

 leaves quite regularly pinnatifid into divaricate linear- or oblong-lan- 

 ceolate entire segments: pods % % * long, linear, more or less curved; 

 pedicels half as long: seeds in 2 rows. Along streams in Marin Co. 



3. R. dictyota (Greene). Stout, erect, 24 ft. high, hirsute-pubes- 

 cent: racemes rather dense: pods ovate-lanceolate; valves firm in text- 

 ure, with strong tortuous midvein and anastomosing veinlets; partition 

 thick, favose-reticulate. Marshes of the lower Sacramento. 



11. BARBAREA, Dodonxus (WINTER CRESS). Erect branching gla- 

 brous biennials or perennials of rather low stature, with angular stems 

 and more or less distinctly lyrate or pinnatifid leaves. Flowers rather 

 small, bright yellow. Sepals equal at base, erect. Pods linear, either 

 somewhat flattened, or more distinctly quadrangular, pointed; valves- 

 more or less carinate. Seeds in 1 row, oblong, turgid, marginless. 



