At^ssum.] CRUCIFERiE. 



49 



3. V, didymocarpa; stellatim tomentosa incana, foliis radlcalibus late obovato-spathu- 



latis reliqiiis lanceolatis subiiitegris, calyce aequali, siiiculis magnis inflatis didymis. 

 (Tab. XVL) 



Radix perenriis, fusiformis, longe descendens, infeme subfibrosa: superne, ad coUum, caules plurimos 

 diffuses, non raro prostrates, profereiis. Hi caules (ut et tota planta, nisi corolla staminaque,) pilis vel 

 squamulis stellatis numerosissimis incani, simplices, dig:item longi. Folia radicalia numerosa, patentes, duas 

 fere tres uncias longa, late obovato-spathulata, obtu&iuscula, inferne in petiolum attcnuata : catdina lancco- 

 lata, obtusa, basi attenuate, integerrima, vel raro snbsinuato-dentata. Florcs speciosi, in corymbos terminales 

 dispositi. Calycis sepala oblonga, erecta, isequalia, obtusa. Pttala kete flava, calyce duplo longiora, obovata, 

 obtusa, basi in unguem attenuata. Stamina petalis breviora. Anther <b o\i\(m^ji, JPistillum: Germen snh- 

 rotundum, didymum : Sfj/hts longus, iillformis : Stigma tnincato-capitatum. Sdicula fere magnitudine 

 Nucis Avellance^ globosa, profunde didyma, stylo subceque longo terminata; lobis rotundatis, ad septum 

 iusigniter contracta. Dissepimentum lanceolatum. Loculi subbexaspermi. Semiita subovalla, superne 

 emarginata, fusca, immargiuata. Cotyledones plano-convexse, accuinbentes. 



Hab. Growing in deep sand upon the Rocky Mountains, between lat. 52° and 57°. Dmmmond. Abun- 

 dant on the barren sandy plains of the Columbia, at Wallawallab and at the Kettle Falls. Douglas. — This is 

 without exception the most singular and most beautiful of the genus Vesicaria, haviug broad leaves, cluthed 

 \vith the curious close stellated pubescence which seems to be almost characteristic of the genus, and large 

 yellow flowers ; and a seed-vessel with its two valves separated by so deep a sinus, that, were it not that the 

 whole habit of the plant is completely that of a Vesicaria, it might almost form a generic character. 



Tab. XVJ. Plant; — natwal size. Fig, 1, Flower; ^^. 2, Petal; ^^. 3, Stamens and pistil ;^^. 4, Pistil; 

 Jig. 5, 6, Fruit : — natural size. Fig. 7, Do. h ith one of the valves removed at Jig. 8 ; Jig. 9, The same : 

 — magnijied. Fig. 10, Frout view of the dissepiment, with the seeds; Jig. 11, Seed; Jig. 12, Transverse 

 section of do. : — magnified. 



11. ALYSSUM. DC. {Alyssi Sp. Linn.) 



Silicula orbicularis aut elliptica, valvis planis aut centro convexis, Semina in quoque 

 loculo 2—4, compressa, interdum ala membranacea cincta. Calyx basi aequalis, Pttala 

 inteirra. Stamina nonnulla dentata. DC. 



1. A, hyperhoreum ; caulibus herbaceis cjBspitosis, foliis elllpticis grosse et acute deii- 

 tatis subhirsutis, siiiculis ellipticis, staminibus majoribus dente auctibus. DC — Linn, Sp* 

 PL /?, 910. WiUd. Sp, PL v, 3. p, 463. Pursli, FL Am. v, 2. p, 434. De Cand. Prodr, r. 

 1. p. 164. — Draba hyperborea. Desv, — Lunaria foliis ellipticis incondite dentatis, Krasck, 

 Nov, Comni. Acad. Petrop. I. ann. 1750. p. 388. t 15. f. 1. 



Hab. In North America; Krascheninnikqf in Linn.; and, according to Pursh, on the North -West 

 coast. — I have seen no specimen of this plant, nor do I know in what part of North -West America it ^vas 

 discovered ; probably in a high northern latitude, if we may judge from its name. Krascheuiunikof appears 

 to be the only author who has described it, and his work I have not the opportunity of seeing. De Can- 

 dolle attributes the discovery of this plant to Steller, who travelled in Siberia and Kamtschatka ; but I am 

 not aware that his researches extended to the American continent. Its Jiowers are said to be white. 



2. A.? dentatum; foliis radicalibus subruncinato-dentatis lincari-lanceolatis, siiiculis 

 ellipticis pubescentibus. DC. — Nutt. Gen. Am. v. 2. p, 63. De Cand. Prodr. v. I. p. 1G5. 



-Draba arabizans. Pursh, FL Am, v. 2, p, 434; not Mich, (according to NuUalL) 



Hab. Canada ? Pursh : but Pursh has probably confounded the Cauadian Draha aralizaiis of Michaux 

 with the Alyssmn dentatum of Nutt. which he found in Virginia : and hence it should probably be excluded 



VOL. I. 



