48 



CRUCIFER^ 



[ Vesicaria, 



carpa is confined to the westward of the Mackenzie River, so is the present plant to the eastward of it, and 

 both inhabit the shores of the sea. Mr. Brown's admirable description of this species, in the place above 

 quoted, and the splendid figure of Mr. Bauer in illustration of the characters of the genus, leave nothing to 

 be desired. If I am correct in referring the three Neurolomata of M. De CandoUe to P. macrocarpa, we 

 have as yet but two species of the genus Parrya described ; but a third, and a more singular one than either of 

 the present, has lately been sent to me from the Altai by Professor Ledebour, under the name of P. exscapa, 

 MSS, The pedicels almost appear to spring at once from the top of the root, and by the number and size 

 of their flowers to conceal the leaves, as do the pods, which are more than 4 inches long and 3 Unes broad. 

 The seeds, however, are scarcely margined, and the funiculus umbilicalis, or seed-stalk, is wholly fixed to the 

 marginal receptacle. 



Trie. II. Alyssine^; seu Pleurorhizeae Latiseptas. DC, 



Silicula longitudinaliter dehiscens, septo lato ovali membranaceo, valvis planis aut 

 concavis. Semina compressa, ssepe marginata. Cotyledones planse, accumbentes (o^), 

 septo parallelae. DC, 



10. VESICARIA. Lam, 



f 



Silicula globosa, valvis membranaceis inflatis. DC, 



1. V, Ludoviciana; stellatim toraentosa, incana, foliis lineari-spathulatis sub integris 

 calyce £equali, siliculis globosis pubescentibusj stylo gracillimo breviori. — De Cand, Prodr, 

 V, 1. p, 159, — Alyssum Ludovicianum. Nutt Gen, v. 2, p, 63. — V. globosa? Desv, Journ. 

 Bot, 3. p, 184. (according to the description.) De Cand, Prodr, v, 1. p. 159, — Myagrum 

 argenteum. Pursh^ FL Am, v, 2, p, 434, 



Hab. Cultivated in the garden of the Horticxiltural Society of London, from seeds sent from North-West 

 America by Mr, Douglas; but the exact station is not mentioned, and it does not occur in the Herbarium, 

 — It quite agrees with my specimens gathered by Bradbiu*y on the hills of the Missouri ; and is best dis- 

 tinguished by the length and slendemess of its style from the following species. 



2. V, arctica; stellatim tomentosa, incana, foliis radicalibus spathulatis reliquis sub- 

 linearibus integerrimisj calyce jequalij siliculis globosis stylo crassiusculo longioribus. 



«c, floribus majoribusj siliculis glabris, — V. arctica. Rich, in Frankl, \st Joum, ed, 2, App, 

 p, 26. De Cand. Prodr, v. 1. p, 159. — Alyssum arcticum, Fl, Dan, t 1520. 



I 



iS, floribus minoribus, siliculis pubescentibus. — V. arctica. Hook, in Bot Mag, L 2882.' 

 V. arenosa. Rich, in Frankl, \st Joum, ed, 2. App, p, 26, De Cand, Prodr, v, 1. p, 160. 



Hab. a. Mostly confined to the Arctic shores and islands, eastward of the Mackenzie River, while an 

 intermediate state (that is, with the siliculse slightly pubescent,) is found on the summit of a hill 700 feet high, 

 at Bear Lake Hiver. Dr. Richardson. /3. Hills and dry prairies at Carlton House. Dr. Richardson. Upon 

 the Rocky Mountains. Drummond. I have received it, gathered in Canada by Mr, Goldie, but without any 

 particular station being given. — Numerous specimens in different states, and cultivation in our gardens, have 

 satisfied Dr. Richardson that Vesicaria arenosa should rather be considered a var. of, than a distinct species 

 from, V. arctica. My own opinion quite coincides with his, and hence I am led to unite them ; nor can I 

 distinguish from V, arctica, specimens I have in my Herbarium, gathered in the plains of Mendoza and hills 

 'about Cordova, South America, by Dr. Gillies and Mr. Cruickshanks. In these specimens, the leaves are 

 sometimes sinuato-dentate, which again brings the plant near the European V, simiata. AU seem to vary 

 with erect and prostrate stems, and with those stems more or less leafy. 



