. ' 



Thysanocarpus.] CRUCIFER^. 



69 



«. foliis radicalibus hispidis. Be Cand, Syst Veget r. 2. p, 539, Prodr. v, 1. /?. 205. 



/3. foliis radicalibus pubescentibus. 



Hab. a. California. Mr. Menzies. j3. Upon the eastern declivity of the Rocky Mountains, lat. 52°, 56°. 

 Drummond. — This has the pinnatifid stem-leaves of the British L. ruder ale ; but the radical leaves are bipin- 

 natifid, and in «. remarkably hispid. De Candolle assimilates it to L. virgimcum, which again leads me to 

 think that he has confounded that plant with the more frequent ruderale, to which the present is, I fear, too 

 closely allied. Cotyledons decidedly incumbent. 



3. L, virginicum; floribus 2-3-andris tetrapetalis, foliis caulinis lineari-lanceolatis in- 

 ciso-serratis, siliculis ovali-orbicularibus (majusculis) emarginatis patentibus, cotyledoni- 

 bus accumbentibus. Linn, Sp, PL p. 900. Mich, Am, v, 2, p, 27. Pursh, FL Am, v, 2, p, 

 435. Elliott, Carol v, 2. p, 140.— L. Iberis. Schkuhr, Handb, v. 2. t. 180. 



Hab. Canada ? — I hare not, it must be confessed, any British American specimens of this plant : nor can 

 I aver that it is a native of that country: but as I possess it from the New England States, I can scarcely 

 doubt but it exists in Upper Canada, All that I bave yet received from Canada, as L. virginicum^ prove, 

 however, to be L. ruderale; to which, indeed, this plant bears so close a resemblance, that, without an ex- 

 amination of the embryo, they can scarcely be distinguished. In the present species, the cotyledons are truly 

 accumhentj as represented by Schkuhr. Hence De Candolle has probably confounded the L. j-udcralc with 

 it, for he describes the cotyledons as incumbent. The flowers are extremely small, and bear petals. The 

 silicuIcB are larger, and perhaps more nearly orbicular, and the plant is less profusely branched. 



28. CAPSELLA. Vent. 



SiUcula triangularis basi cuneata, valvis navicularibus aptcris, loculis polysperniis. 

 Cotyledones incumbentes. 



1. C, Bursa- Pastoris, — " Mcench, MetL 271," De Cand. Prodr, v, l, p, 177. — Thiaspi 

 Bursa-Pastoris. Pursh, Fl, Am. v, 2. p, 435. Elliott, Carol, v, 2, p. 141, Engl. Bot. t, 1485. 



Hab. Frequent to the eastward of the Rocky Mountains, extending as far north as the Great Bear Lake, 

 or nearly to the Arctic Circle, Dr. Richardson; Drummqnd; Douglas. Newfoundland. Mr. Cormack. 



Trie. VII. IsAXiOEiE, seu Notorhizeae Nucainentaceai. SiUcula valvis indistinctis aut inde- 

 hiscentihus carinatis, septo evanido, l-locularis, l-sperma, Semina ovato-oblonga, Coty- 

 ledones plance, incumherUes, septo {si adesset) verosimiliter parallelce, DC, 



29. THYSANOCARPUS. Nov. Gen. 



SiUcula obovata, plano-convexa, undique latissime marginato-alata, apice emargiiiuta, 

 unilocularis, evalvis, monosperma. Semen late obovatuni, pendulum. Radicula insertione 

 dorsalis, obliqua et ad niargines cotyledonum applicata. — Floras parvi, albi, racemosi, 

 ^\X\c\x\3^ pendulcB. — Genus Tauscheriae affinis. An vere distincium? 



1. T, curvipes, (Tab. XVIII. A.) 



Radix parva, annua, subfusiformis. Caulis soUtarius, plerumque ramosus, erectus, 6-8-polUcans ad 

 pedalem, parce foliosus, inferne subpilosus. Folia pleruraque radicalia, patentia, duas uncias lonj^a, pinnati- 

 fida hirsuto-scabra, laciniis brevibus, obtusis, basi attenuata. Caulina remota, lineari-oblouga, basi latiora, 

 subsatnttata, superiora sensim minora. Flores racemosi, parvi, ramos terrainantes. Pedicelli floribus paulu- 

 lum longiores, graciles, glabcrrirai, patentes, demum, fructiferi, insigniter deflexi et elongati. Calyx: sepala 

 8equalia°ovalia,"'convexa, glabra, erecto-patula. Petala minuta, lineari-oblonga, basi attenuata, iutegra, alba, 

 gepalis breviora. Stamina 6, tetradynama : Filamenta fiUfonnia, edentula: Anther<£ subgiobosK. Germem 



