12 RANUNCULACE^E. THALICIRUM. 



MYOSDRUS. 



petioled, 3-4-ternate ; leaflets approximate, petiolulate, moderately firm, 

 rounded and lobed at the apex, rugose-veiny beneath : panicle simple, nar- 

 row, its short erect branches few-flowered : flowers dioecious, small ; sepals 

 ovate : stamens 10-20, on slender filaments ; anthers oblong, slender-point- 

 ed : achenes about 8, nearly sessile, 2 lines long, ovoid, tapering into a 

 straight beak, thick-walled, 2-edged. with 4 or 5 longitudinal grooves and 

 rounded ridges on each side : seed ovoid, pointed at one end, filling the 

 achene. Klickitat Co, Washington to Brit, Columbia and Wyoming. 



T. oecidentale Gray Proc. Am. Acad. viii, 372. Stem slender, 1-3 feet 

 high; leaves 2-4-ternate, the lowermost petioled; leaflets thin, 3-10 lines 

 long, 3-9-lobed at the summit, sparingly glandular-puberulent beneath : 

 flowers dioecious, rarely polygamous, nodding, on very slender pedicels, in 

 an ample open panicle : filaments purplish, slender ; anthers linear, cuspi- 

 date : achenes 1-10 in each head, lanceolate or somewhat falcate, 4-7 lines 

 long, tapering below into a short stipe, and above .into a long one-sided 

 curved beak, acutely 8-10 ribbed. Along streams, and moist shady places, 

 Brit. Columbia to California, west of the Cascade Mountains. 



4 MYOSURUS Dillenius Giess. 106, t. 4. L. Gen. n. 394. 



Little annuals with linear or linear-spatulate entire leaves, and 

 solitary flowers on simple scapes. Sepals 5 or 6, spurred at base. 

 Petals as many as sepals, on long claws, with a pit at the summit. 

 Stamens 6-20. Achenes with a prominent costa terminating in an 

 erect or more or less spreading beak, numerous on a slender or 

 conical receptacle. Ovule suspended. 



4 M. in ini in us L. Sp. i, 284. Leaves linear: scapes 1-4 inches high, about 

 equaling the leaves ; receptacle in fruit an inch ojr more high : achenes 

 quadrate with a broad back, truncate at the apex; beak short, appressed: 

 seed oval. In wet places, Willamette valley to California and the Atlantic 

 States and Europe. 



M. apetalus Gay Hist. Chil. Bot. i, 31, t. 1, fig. 1. Scapes 1-2 inches 

 high, usually spreading, but little surpassing the linear leaves ; petals often 

 wanting: spike of achenes 3-10 lines long, ovoid-oblong and more or less 

 squarose, or cylindrical: achenes oblong, thin-walled, with narrow, prom- 

 inently carinate back prolonged into a spreading or ascending beak : seed 

 oblong. In alkaline places, California to Brit, Columbia east of the Cascade 

 Mountains : also Chili. 



M. lepturus. M. apetalus var. lepturus, Gray, Bull. Torr. Club, xiii, 2. 

 Scapes in fruit 3-6 inches high, erect, surpassing the linear-spatulate leaves : 

 receptacle in fruit 8-24 lines high : achenes with broad, distinctly carinate 

 back, and short, appressed beak : seed elongated-oblong, Common in wet 

 places, from California to Brit. Columbia and the Rocky Mountains. 



M. sessilis Watson Proc. Am. Acad. xvii, 362. Scapes very short or 

 none : fruiting heads several, crowded, much shorter than the leaves : rec- 

 eptacle short and thick, often sessile, 1-6 lines long by 1-2 lines thick at 

 base; achenes oval, scarious-utricular, with narrow salient keel, and subu- 

 late, erect beak: seed short-oval. A rare species, the only locality known, 

 )>eing an alkaline flat seven miles south of Arlington Oregon. 



Tribe 3. Ranunculex, DC. Sepals imbricated in the bud. Pistils 

 numerous, rarely few, 1-ovuled, becoming achenes. Ovule ascending. 

 Herbs with alternate cauline leaves 



5 TRAUTVETTERIA Fischer & Meyer Ind. Sem. 1835, 22. 



Herbs with palmately lobed alternate leaves, and small flowers 

 in terminal corymbose panicles. Sepals usually 4, concave, petal- 



