Loasece.} CALIFORNIA.— SUPPLEMENT. 343 



humillimo foliis radicalibus lanceolatis longe petiolatis dentato-pinnatifidis multo breviore, 

 calycis tubo longissimo, capsula oblongo-cylindracea obscure tetragona. 



Hab. Near the Blue Mountains, and about the Salmon Falls of the Snake River, Snake Country. Mr 

 Tolmie. — The flowers are large and handsome ; the tube about a3 long as the radical leaves. 



12. CE. (Eucenothera) odorata. Jacq.? 

 The leaves are rather more hairy than usual ; but we perceive no essential difference. 



1. Gaura (Spach) decorticans ; glabra basi fruticosa, foliis lineari-lanceolatis utrinque 

 attenuatis dentatis, junioribus pubescentibus, spicis bracteatis laxis brevibus obtusissimis, 

 ovario longe subulato subpubescente, calycis tubo ovario 2-3-plo breviore lacinias petala- 

 que aequantibus, stigmate subgloboso 4-lobo. 



The bark is a shining white, with a reddish tinge, and readily peels off from the stem. Leaves two to 

 three inches long. Bracteas leafy, linear, shorter than the subulate germen. Petals 4, somewhat unilateral. 

 Style longer than the stamens. The spike, while one or two of the lower flowers only are open, is broad 

 and very obtuse, and resembles the raceme of a Diploiaxis. 



Okd. XXI. SALICARIE^. De Cand. 

 1. Lythrum lineare. Linn. 



Ord. XXII. LOASEiE. Juss. 



1. Bartonia Icevicaulis. Dougl. in Hook. Fl. Bar. Am. 1. p. 221. t. 69. 



2. B. aurea. Lindl. in Bot. Reg. t. 1831. Hook. Bot. Mag. t. 3649. 



3. B. micrantha ; tota pilis brevibus hispida, caule erecto dichotomo albescente, foliis 

 ovatis acuminatis basi cuneatis sessilibus sinuato-pinnatifidis, floribus glomeratis folio 

 florali brevioribus ebracteatis, petalis 5 ovatis segmenta calycina superantibus, staminibus 

 15-20, 5 petaloideis apice emarginatis, capsula oblongo-cylindracea 3-sperma apice tri- 

 valvi, stylo leviter spiraliter torto (Tab. LXXXV.) 



The hairs are jointed, and some of them, particularly those on the pedicels and branchlets near the flowers, 

 are spinulose at the joints ; the spines verticillate and reflexed. This plant has quite the habit of Mentzelia, 

 especially in the broad foliage and few-seeded fruit, and the B. albicaulis tends to unite Acrolasia of Presl 

 again to Bartonia ; indeed we scarcely find a single character left to distinguish that genus. None of the 

 species can be said to have more than 5 petals : B. ornata has 5 sterile petaloid stamens ; B. Itevicaulis, 

 parviflora,micrantha,<mA probably also B. nuda, have the petaloid stamens antheriferous ; while B. albicaulis, 

 aurea, and Acrolasia Bartonoides are destitute of the petaloid stamens. In B. ornata, lavicaulis, and some 

 others, the stamens are very numerous ; in B. albicaulis there are about 30 ; in B. micrantha not more than 

 20 ; and in Acrolasia, 10. The seeds in most of the species are very numerous ; in B. albicaulis fewer ; but 

 in B. micrantha, and in Acrolasia they are reduced by abortion to one to each placenta, placed in the cap- 

 sule one above the other. The only difference then between Acrolasia and Bartonia lies in the style of the 

 former not being twisted, and spirally twisted in the latter ; but that character again is weakened by our present 

 species, for here the style is so slightly twisted as scarcely to be perceptibly so. From Bartonia we do not see 

 how Mentzelia can well be distinguished. Kunth's two species have 10 petaloid fertile outer stamens ; M. 

 hispida 10 outer subulate stamens, longer than the others ; while in M. aspera and oligosperma they are 



