NASTURTIUM.] CRUCIFERJS. 23 



sometimes 6 in. Flower | in. diam. Pod about as long as its pedicel ; style 

 very short. Seeds angular. DISTRIB. Europe (Arctic), N. Africa, temp, and 

 cold Asia and America. 

 4. N. amphib'ium, Br. ; rootstock short stoloniferous, leaves entire 



toothed or pinnatifid, petals yellow twice as long as the sepals, pod oblong 



shorter than its pedicel. Armora'cia, Koch. 



Wet places in England and Ireland ; doubtfully native in Scotland ; fl. June- 

 Sept. Stem 2-4 ft., erect. Leaves pinnatifid chiefly when submerged, base 

 often ^-amplexicaul. Flowers | in. diam. Pod in., pedicels spreading or 

 deflexed; style slender ; stigma large, capitate; seeds small, oblong. DIS- 

 TRIB. Europe, N. Africa, temp. Asia. 



3. BARB ARE' A, Br. "WlNTER-CRESS. 

 Erect, branched, glabrous, biennial herbs. Stem angular. Leaves entire 



lobed or pinnatifid. Flowers yellow, sometimes bracteate. Sepals suberect, 



equal. Petals clawed. Pod linear-elongate, compressed, 4-angled, acumi- 

 nate ; valves keeled or ribbed ; style short, stigma capitate or 2-lobed. 



Seeds 1-seriate, oblong, not margined ; cotyledons accumbent. DISTRIB. 



All temp, regions ; species about 6. ETYM. Dedicated to St. Barbara. The 



usually straight and stiff pods, with keeled valves, 1-seriate seeds, and 



habit, chiefly separate this from Nasturtium. 



1. B. vulga'ris, Br. ; leaves toothed or pinnatifid at the base, pod short 



4-gonous acuminate broader than its slender pedicel, style straight distinct. 



Hedgebanks, water-sides, from the Clyde and Elgin southwards ; fl. May- 

 Aug. Stem rigid, erect, angled, glabrous, simple or sparingly branched. 

 Lower leaves pinnate, rarely pinnatifid, terminal leaflet usually largest ; 

 upper subentire or pinnatifid with amplexicaul auricled bases. Flowers 

 small, bright yellow. Pods f-1 in. ; style in. DISTRIB. Europe, temp. 

 Asia, S.Africa, Australia, and N, America ; ascends to 17,000ft. in the 

 Himalaya. 



Sub-sp. VULGA'HIS proper ; raceme about as long as broad, petals twice as 

 Jong as the sepals, pods in a dense raceme 3-6 times as long as their pedicels 

 erect rarely spreading, seed lg times as long as broad. Common. 



Sub-sp. ARCUA'TA, Reich, (sp. ) ; raceme elongate, petals rather more than 

 twice the length of the sepals, pods in a lax' raceme arched and spreading 

 when young 5-8 times as long as their pedicels, seed more than twice as 

 long as broad. Rare, Loughgall, Armagh. 



Sub-sp. STRIC'TA, Andrz. (sp.) ; terminal segment very large, pods in a dense 

 narrow raceme erect 4-6 times as long as their pedicels, seed nearly twice 

 as long as broad. Rare, Yorkshire, Northampton, Essex. Attains Arctic 

 Europe. 



Sub-sp. INTERME'DIA, Boreau (sp.); leaf-segments many, petals twice as 

 long as the sepals, pods in a dense raceme erect 4-6 times as long as their 

 pedicels, seeds nearly as long as broad. Cultivated fields, probably intro- 

 duced. Intermediate between B. vulgaris and prcecox. 

 1>. PR^'COX, Br. leaves pinnatifid, segments narrow, petals 3 times as 



long as the sepals, pods long and distant scarcely thicker than their veiy 



stout short pedicels, style very short. American Cress. 



Roadsides, &c., a garden escape; an alien, Watson ; fl. April-Oct. Very 

 similar to the preceding, of which I suspect it is a cultivated form. Setds 



