J^raba.] CHUCIFER^. 



31 



3. Z). glacialis; scapo nudo stellatim pubescente vel glabro, foiiis lineari-lanceolatis 

 rigidis integris stellato-pubescentibus, petalis (flavis) calycem duplo longioribus, siliculis 

 longe racemosis (an semper?) oblongo-ovatis, stylo hvQvl— ''Adams, Mem. Soc. Nat Mosq. 

 5. p. 106." De Cand, Frodr. v. L p. 167. Graham in Edin, PJiiL Journ. 1829. p. 183. 



«. scapis pedicellis siliculisque glabris, floribus pallidis. 



jS. scapis pedicellisque pubescentibus, siliculis glabris. 



y. 



scapis pedicellis siliculisque valde pubescenti-hirsutis. 



h minor, scapis numerosis pedicellisque glabris, floribus pallidioribus, 

 s. minor, scapis pedicellisque glabris, floribus intense luteis. 



Hab. Rocks on the loftiest of the Rocky Mountaius, between lat. 52° and 57°. Drummond. Rare on 

 the shores of the Arctic Sea. Br. Richardson, — Closely allied, as De Candolle observes, to the two preced- 

 ing- species; differing from both in its longer, narrower, and more rigid leaves, which are clothed with short, 

 and generally dense, stellated pubescence, and furnished, on the underside especially, with a strong and 

 prominent midrib. In consetiuence of their firm texture, the former years' leaves remain attached at the 

 base, when they lose their pubescence, becoming bleached and glossy, so as greatly to resemble D. aizoides, 

 from which again this species differs by its pubescent, never ciliated, leaves, and far shorter, though yet very 

 evident, style to the capsule. 



4. jQ. oligosperma ; scapo nudo subpiibescente, foiiis ercctis rigidis subnitidis linearibus 

 ciliatis versus apiceni praecipue utrinque stellatim pubescentibus, petalis (albis) calycem 

 pilosiusculum duplo excedentibus, siliculis pubescentibus longe racemosis ellipticis basi 

 apiceque acutis 4—8 spermis, stylo sub J breviore. 



Radix perennis, tenuis, sublonge descendens, superne multiceps. Caules breves, unciam-2-uucias longi, 

 ramosi, inferne foliorum vetustorura vestigiis obsiti. Folia erecta, linearia, obtusiuscula, inferne subattenuata, 

 rigida, nitida, utrinque sed versus apicem praecipue stellatim pubescentia, margine ciliata, pills simplicibus vel 

 ramosis. Scapi terminales, nudi vel raro versus basin unifoliati, rigidiusculi, digitales, pedicellique 

 minute stellatim pubescentes. Flares etiam racemosi. Califx glaber, vel parce pilosus, pilis patentibus. 

 Petala alba, obovata, basi in unguem attenuata. Pistillum: Germen oblongum, utrinque attenuatura, sti/lo 

 subtriplo breviore terminatum : Stigma integrum. SiliculcB in racemum laxum, duas uncias longie, elliptic^, 

 planje, utrinque acutse, pube brevi sparsa tectse, loculis 2-3, rarius 4-spermis. Stylus evidentissimus, silicula 

 subquadruplo brevior, stigmate integro capitato. Pedicelli fructiferi siliculis paulo longiores. 



Hab. Summit of a limestone hill, Mackenzie River, lat. 68°. Dr. Richardson. — Unwilling as I am to 

 increase the number of species in this most difficult genus, I yet venture to do so in the case of the present 

 individual, which was found in considerable abundance and perfection, though only in one spot, bearing 

 both flowers and fruit. Although in the three preceding species, if such they may be called, De Candolle 

 designates the style as hrevissimus, it can only be so in reference to that of his preceding groupe, the 

 Aizopsis family ; for the style is assuredly much louger than in any of the following species with naked 

 scapes. Now, in that particular, and in the rigid foliage and generally short stellated pubescence, it approaches 

 jD. glacialis, whilst its white flowers and general habit assimilate it with the Z). hirta tribe. It is remarkable 

 for having the lower pedicels of the raceme bearing fruit, whilst the upper ones have perfect flowers. The 

 seeds are mostly two or three in each cell. 



5, Z). pauciflora; scapis aphyllis pedicellisque pilosis, foiiis lanceolatis integerrimis pilis 

 furcatis simplicibusque, petalis (flavis) spathulatis calycem hirsutum vix superantibus, 

 ovariis glabris. Br, in Parry" s 1st Voy. Jpp. p. cclxvi. HooL in Parry's 2d Voy. App. 

 p. 385. . 



Hab. Melville Island. Capt Sabine. Barrow River. Cc^t. Sir E. Parry. « Dubia species, alpitus 



G 2 



