676 SAXIFRAGACEiE. Bovkinia. 



the base often narrow : petioles 3-4 inches long, with a few scattered glandu- 

 lar hairs. Bracts (small, foliaceous), peduncles, and short pedicels, as well 

 as the upper part of the stem, glandular-pubescent. Flowers smaller than 

 in S. Virginiensis, white. Ovary 2-celled ; the carpels united nearly to the 

 summit, free from the campanulate calyx except at the very base : styles 

 short : stigmas minute. — We have not seen the fruit of this interesting 

 plant, which its zealous discoverer obtained in flower only. It must doubt- 

 less rank among the anomalous pentandrous species of Saxifraga, but it is 

 very different from any other described. It has manifest points of resem- 

 blance to Heuchera; but the ovary is perfectly 2-celled, with a central 

 placenta; the petals conspicuous, &c. 



S. petiolaris (R. Brown.) — This species is indicated, although we believe not 

 described, in Ross' \st voy. {ed. 2) 2. p. 192, a work which we regret is not at 

 present accessible to us. It is again mentioned in the supplement to Parry's Voy- 

 age under S. hyperborea (which Hooker unites to S. rivularis), where it is said to 

 be distinguished from both these species " by all the leaves being dotted with sub- 

 sessile glands, the radical ones equalling or exceeding the scape, the floral leaf 

 lobed; the petals 3-nerved."— Dr. Richardson {appx. Frankl. journ. ed. 2. p. 14) 

 takes notice of a specimen collected on the Arctic sea-shore, which was thought to 

 belong to S. rivularis, but which he supposes may be the S. petiolaris, chiefly on 

 account of the tripli-nerved petals. Neither of these plants is, we believe, taken 

 up by Hooker. 



S. nutans, Don {Saxifr. I. c.p, 368), is RomanzoviaUualaschcensis! (v. sp. in 

 herh. Banks.) 



S. androsacea, Linn., is given by Pursh as a native of the North West Coast, 

 on the authority of a specimen in the Banksian herbarium. The figure of Jacquin 

 being cited with a mark of doubt, and as Mr. Don does not notice the plant, it 

 belongs probably to some different species. 



S. spathulata 0. ? arctica, Seringe (Antiphylla, Haw.) from Melville Island, 

 wo are unable to identify. 



3. BOYKINIA. Nutt. in jour. acad. Philad. 7. p. 113. 



Calyx turbinate, at length urceolate, coherent with the ovary ; the limb 

 spreading, 5-cleft ; segments triangular, acute, valvate in estivation. Petals 

 entire, longer than the lobes of the calyx, deciduous. Stamens 5, inserted in 

 the throat of the calyx, shorter than its segments : anthers 2-celled. Styles 

 2-3, short : stigmas simple. Capsule invested with the coherent urceolate 

 calyx-tube, 2-3-celled, with a central many-seeded placenta, 2-beaked, de- 

 hiscent between the beaks. Seeds horizontal, ovoid, glabrous (minutely 

 marked with elevated dots under a strong lens).— Perennial herbs, with leafy 

 stems. Leaves alternate, palmately veined and lobed, incisely toothed ; the 

 teeth mucronate : petioles scarcely stipuliform at the base. Flowers small, 

 in corymbose cymes. 



Intermediate between Saxifraga and Heuchera, as Nuttall remarks, but more 

 nearly allied to the former ; which has a few pentandrous species. The genus is 

 dedicated to Dr. Boykin, of Georgia ; whose name frequently occurs as a contnbu- 

 tor to this work. 



1. B. aconitifolia (Nutt.) : glandular ; leaves somewhat glabrous, dilated 

 and somewhat'truncate at the base, deeply 5-7-lobed ; cyme viscid, fastigi- 

 ate, the flowers secund ; teeth of the calyx broadly triangular.— iVw«. .' I. c. 



