Steironema. PRIMULACEvE. 61 



tered small scales or small leaves below, and a cluster or apparent whorl of larger 

 leaves at summit ; these veiny, entire or obscurely serrulate, nearly sessile. 

 Peduncles filiform in some of the upper axils, one-flowered, in spring. Sepals 

 slender, linear-lanceolate, united only at base. Corolla white or pinkish. Capsule 

 with about 5 revolute valves. Seeds few, rather large, covered with a white cel- 

 lular-reticulated pellicle, remaining for some time fast on the placenta in a globular 

 mass. - - The following are all the known species. 



T. Americana, Pursll. Stem very naked below, unequally 5-9-leaved at summit, a 

 span high : leaves lanceolate, acuminate at both ends : divisions of the white corolla finely 

 acuminate. Bart. Fl. Am. Sept. ii. t. 47. T. Europcea, Michx. T. Euroj/mt, var. Ameri- 

 cana, Pers., & var. anyustifolia, Torr. Fl. 1. 3o3. Damp woods, from Labrador to the Sas- 

 katchewan and the mountains of Virginia. 



T. Europeea, L. Stem either naked or with a few scattered leaves below the cluster of 

 obovate or lanceolate-oblong obtuse or abruptly somewhat pointed leaves: divisions of the 

 white or pink corolla abruptly acuminate or mucronate. Alaska, &c. (Eu. to N. E. Asia.) 

 Var. arctica, Ledeb. Very like small specimens of the Old World plant, 2 to 4 

 inches high, with obtuse or retuse leaves, the larger barely an inch long, and gradually 

 decreasing ones down the upper part of the stem: corolla white. -- T. arctica, Fischer in 

 Hook. Fl. ii. 121. T. Europcea, Cham. & Schlecht. Mountains of Oregon to Aleutian 

 Islands and Behring Straits. 



Var. latif 61ia, Torr. Stem naked below in the manner of T. Americana ; the whorl 

 or cluster of 4 to 7 oblong-obovate or oval mostly acute leaves (14- to 4 inches long), rarely 

 proliferous: corolla from white to rose-red. Pacif. R. Exp. iv. 118; Gray, Bot. Calif. 

 i. 469. T. lulifolia, Hook. 1. c. Woods, W. California to Vancouver's Island. 



7. STEIRONEMA, Raf. (From O-TC/VIO,-, sterile, and '//,, thread, refer- 

 ring to the presence of staminodia alternating with the fertile stamens.) 

 Leafy-stemmed perennials, glabrous except the ciliate petioles, destitute of glands 

 or dots ; the leaves all opposite, but mostly in seeming whorls (in the manner of 

 Trientalis) on the flowering branches; the slender peduncles as in Trientalis ; so 

 also the corolla except that it is yellow. Filaments and bottom of the corolla 

 granulose-glandular. Fl. summer. Raf. in Ann. Gen. Phys. Bruxelles, vii. (1820) 

 192 ; Baudo in Ann. Sci. Nat. ser. 2, xx. 346 ; Gray in Proc. Am. Acad. xii. 

 62. Lysimachin Sele'ticia, Bigel. Bost. ed. 2, 74. Lysimachia Steironema, Gray, 

 Man. ed. 1, 283. 



* Leaves membranaceous, pinnately veined even when linear, at least the lower ones petiolecl : 

 corolla sulphur-yellow. 



S. ciliatum, Raf. Stem erect, 2 to 4 feet high, mostly simple : leaves ovate-lanceolate 

 or oblong-ovate, gradually acuminate (5 to 2 inches long), and mostly with rounded or 

 subcordate base, minutely ciliate ; the long petioles hirsutely ciliate : corolla exceeding the 

 calyx, about three quarters inch in diameter. Gray, Proc. Am. Acad. 1. c. Lysimachia 

 ciliata, L. ; Engl. Bot, t. 2922, & ed. Syme, 1. 1543 ; Reichenb. Ic. Germ. xvii. 1. 1086. L. quad- 

 rifolia, var., L. Syst. & Mant. Low grounds and thickets, Nova Scotia to Georgia, and 

 west to Br. Columbia and New Mexico. (Sparingly nat. in Eu.) 



S. radicans, Gray. Stem slender and branching, soon reclined, the weak long branches 

 often rooting in the mud : leaves smaller than in the foregoing, especially on the branches, 

 not at all cordate, not ciliate, the margined petioles slightly so : calyx-lobes broader (ovate- 

 lanceolate) and equalling the corolla, which is only a third of an inch in diameter. I->ysi- 

 machia radicans, Hook. Comp. Bot. Mag. i. 177. Swamps, W. Virginia to Arkansas and 

 Louisiana. 



S. lanceolatum, Gray. Stems erect, a foot or two high, simple or paniculatcly branched, 

 somewhat angled : leaves lanceolate or linear, an inch or two long, tapering into a short 

 and margined ciliate petiole or attenuated base ; the radical and sometimes lowest cauline 

 from oblong to orbicular, small: corolla about two thirds inch in diameter; its divisions 



