Nasturtium.] CRUCIFER^. 25 



brown. Stem 2-4 ft., rooting, often floating, fistular. Leafets 3-6 pair. 

 Racemes short, flowers J-| in. diam. Disk-glands 4. Pods | in., deflexed or 

 horizontal, longer than the pedicels ; valves beaded ; seeds suborbicular, 

 compressed.— Distrib. Europe, W. Asia, N. Africa ; introd. in 1ST. America 

 and the colonies, and choking some rivers of N. Zealand. 

 JV. officinale proper ; decumbent, terminal leaflet broadest and largest. — Tar. 

 siifo'lium, Keichb. ; erect, tall, leaflets subequal, terminal oblong. — Var. 

 mlcrophyl'lum is a starved terrestial state with small leaflets. 



2. N. sylves'tre, Br. ; rootstock creeping, leaves deeply pinnatifid, 

 leaflets many lanceolate more or less cut nearly equal, petals yellow twice 

 as long as the sepals, pod linear. 



Moist waste places from the Tay southd., rare in the north ; S. Ireland, rare ; 

 Channel Islands ; fl. June-August.-^-*S'^j/t angular, flexuous. Leaves very 

 variable. Racemes short ; flowers £ in. diam. Disk-glands 6. Pods §-£ iD., 

 curved, pedicel very slender longer or shorter than the pod ; seeds minute, 

 hardly 2-serjate.— Distrib. Europe, N. Africa, temp, and subtrop. Asia ; 

 introd. in America. 



3. N. palus'tre, DO. ; leaves lyrate-pinnatifid, lobes few broad 

 unequally cut, terminal of the lower leaves very large, petals yellow 

 equalling the sepals or shorter, pods linear- oblong turgid. N. terres'lre, Sm. 

 Damp places from the Clyde southd.; Ireland; fl. June-Oct — Stem 1-2 



ft., erect or inclined. Leaves pinnate or pinnatifid, terminal leaflet some- 

 times 6 in. Flower | in. diam. Disk^glands 4. Pods equalling or exceed- 

 ing their pedicels ; style very short ; seeds angular.— Distrib. Europe 

 (Arctic), N. Africa, temp, and cold Asia and America. 



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

 toothed or pinnatifid, petals twice as long as the sepals, pods oblong 

 shorter than their pedicels. Armora'cia, Koch. 



Wet places, York to Somerset and Kent ; Ireland ; Channel Islds. ; fl. June- 

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

 |-amplexicaul. Flowers £ in. diam. Disk-glands 4. Pods | in., pedicels 

 spreading or deflexed ; style slender ; stigma large, capitate ; seeds small, 

 oblong. — Distrib. Europe, N. Africa, temp. Asia. 



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



Erect, glabrous, biennials. Stem angular. Leaves entire lobed or 

 pinnatifid. Flowers yellow, sometimes bracteate. Sepate suberect, equal. 

 Petals clawed. Disk-glands 6. Pods linear, elongate, compressed, 4-angled, 

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

 Seeds 1-seriate, oblong, not margined ; radicle accumbent. — Distrib. 

 Temp, regions ; species about 6. — Etym. Dedicated to St. Barbara. — The 

 straight stiff pods, keeled valves, and 1-seriate seeds, separate this from 

 Nasturtium. 



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

 short acuminate, pedicels spreading, style distinct. 

 Hedgebanks, water-sides, from the Clyde and Aberdeen southd. ; Ireland ; 



Channel Islds.; fl. May-Aug.— Stem rigid, erect, simple or sparingly branched 



