292 PROCEEDINGS OF THE AMERICAN ACADEMY. 



* Leaves ovate, elliptic or linear, not acerose. 

 -*- Annuals. 



A. SERPYLLIFOLIA, L. (THYME-LEAVED SANDWORT.) AuUUal, 



finely pubescent, much branched : leaves very short, 2-3^ lines in 

 length, ovate, acute or acuminate, rather distinctly 3-5-nerved, rounded 

 at the base; the lowest only being narrowed to a short petiole : flowers 

 numerous in open leafy cymes; pedicels 1-3 times the length of the 

 ovate-lanceolate acuminate hispidulous sepals: petals small, about two 

 thirds the length of the sepals : capsule flask-shaped. — Spec. 423 ; 

 Michx. Fl. i. 274; Ell. Sk. i. 518; Torr. & Gray, Fl. i. 182.— 

 Sandy soil, Lower Canada and New England to Florida and to Oregon, 

 Washington, and British Columbia. (Nat. from Europe.) 



Var. tenuior, Koch. More delicate: leaves reduced: flowers 

 smaller in a nearly naked racemose panicle : capsule more oblong. — 

 Syuop. 117. A. leptoclados, Guss. Fl. Sic. Syn. iii. 824. — Portland, 

 Oregon, Brandegee. Suksdorf's specimens from Mc Cloud Lake are 

 somewhat similar. (Europe.) 



A. Benthamii, Fenzl in herb. A. slender annual, branched 

 from the base; branches finely pubescent in lines: leaves short, 3-4 

 lines in length, elliptic-lanceolate, acute and apiculate, often punctate, 

 narrowed to a sessile base, or the lowest to short ciliated petioles; 

 floral leaves much reduced : pedicels filiform, many times exceeding 

 the ovate acuminate glabrous often punctate sepals : seeds dark 

 brown, minutely tuberculate. — Torr. & Gray, Fl. i. 675 ; Gray, PI. 

 Wright, ii. 18; Torr. Bot. Mex. Bound. 36. A. monticolu, Buckley, 

 Proc. Acad. Philad. 1861, 449. — Rocky ground, Texas, Drummond, 

 Wright, Thurber, Hall, Reverchon ; New Mexico, Thurber. 



•»- -t- Perennials. 



A. ciliata, L. Minutely glandular-puberulent: stems numerous, 

 slender, terete, leafy, densely matted, or in less exposed situations 

 spreading and ascending, 1-5 inches long, terminally 1-3-flowered : 

 leaves small, ovate-oblong or lance-oblong, scarcely acute, 1-3 lines 

 in length, distinctly ciliate near the cuneate base: peduncles erect, 

 2-5 lines long: sepals ovate-oblong, obtuse, nerved, 1|-H lines long: 

 petals of similar shape and equal length : stamens 8-10 : valves of 

 the capsule rather deeply bifid exceeding the calyx. — Spec. 425 ; 

 DC. Prodr. i. 411 ; Fenzl in Ledeb. Fl. Ross. i. 370. (High moun- 

 tains and arctic regions of Europe.) 



Var. (?) humifusa, Hornem. Leaves without ciliation : sepals 

 nerveless. — Hornem. ex Lange, PI. Groan. 132. A. Norregica, 

 Gunn, Fl. Norv. ii. 145, t. ix. f. 7-9. A. humifusa, Wahlb. Fl. Lap. 



