CROWFOOT FAMILY 289 



numerous; filaments often clavate or dilated. Pistils few; stigmas elongate, 

 unilateral. Achenes stipitate or sessile, ribbed or nerved. 



Plowers perfect. - , . , z,i ^ m-c 



Plant 2 dtn. or less (rarely 3 dm.) high; achenes turgid; filaments fihforai. 



- 1. r. alpinum. 



Plant 3-10 dm. high; achenes flat and very oblique; filaments clavate. 



2. T. sparsinorum. 



Flowers dioecious or polygamous. . , i ., ^ 



Achenes turgid, thick-walled: ribs thick and almost corky, separated by acute grooves. 

 Plants polygamous; stem-leaves subsessile, the basal ones petioled. ^ . , _ 

 Achenes. petlolules, and lower surfaces of the leaves decidedly yiscid-pubes- 

 pgut' ^ 3. 7. dasycarpum. 



Achenes. petiolules. and the lower surfaces of the leaves glabrous or slightly 

 viscid-puberulent. 4. T. purpurasccns. 



Plants dioecious; all leaves petioled. . ^ , i -^^a 



Achenes equaUy acutish at both ends; leaves very thin and not stronglj \emed. 



Achenes more acute at the upper end than at the lower; leaves firm strongly 

 vemed ®- ^' renutosw/n. 



Achenes more or less flattened, thin- walled; ribs not thick, separated by wide. 



shallow, rounded grooves. 



Achenes more than twice as long as broad, slightly if at all oblique. 



Achenes about 4 times as long as broad, 6-8 mm. long, 1.5-2 mm. wide. 



7. T. occidentale. 



Achenes less than 3 times as long as broad. .„.^„.„r„„„ 



Achenes 6-8 mm. long. 2.5-3.5 mm. wide. 8. T. megacarpum. 



Achenes 4-5 mm. long, 1.5-2 nmi. wide. 9. T. columbianum. 



Achenes not quite twice as long as broad, decidedly oblique. pf^digri 



Achenes stipitate. H- T.jtipitatum. 



1. T. alpinum L. Stem glabrous; leaves mostly basal, 2-10 cm. long, pin- 

 nate, with the lower primary divisions ternate; leaflets cmieate-obovate to or- 

 bicular, firm, 3-10 mm. long, 3-5-lobed at the apex; mflorescence usuaUy a 

 raceme; anthers oblong-linear; achenes few, lance-obovoid, turgid, with thick 

 ribs. T. scopulorum, T. cheilanthoides, T. subspensum, T. leiophyUum,a.n(i 1, 

 duriusculum Greene. Bogs: Greenl.— Newf.— Colo.— Cahf.— Alaska; n li^urasia. 



Mont. — Alp. Je-Jl. 



2. T. sparslflorum Turcz. Stem glabrous, leafy; leaves bi- or tri-ternate, 

 the lower petioled, the uppermost sessile; leaflets thin, pulverulent-glandular 

 beneath, cordate, usually 3-cleft and the divisions 3-lobed, 1-2 cm. long; achenes 

 6-12, half rhombic with a straight back, glandular-pulverulent, with about three 

 faint ribs, 5-6 mm. long, 3-4 mm. wide. T. utakense Greene. Moist places: 

 Alaska— Calif.— Colo.— Hudson Bay; n Asia. Submont.—Mont. Je-Au. 



3. T. dasycarpum Fisch. & All. Stem tall, 5-20 dm. high; leaves 3-5 times 

 ternate; leaflets ovate or obovate, rather thick, dark green above, paler and 

 strongly veined beneath; achenes obliquely oblanceolate, about 5 mm. long and 

 2 mm. wide. Copses and meadows: Ont.— la.— n Is.M.— Sask. Plain— Mont. 



Je-Au. 



4. T. purpurascens L. Stem tall, glabrous, 3-20 dm. high; leaves 3-5 

 times ternate, glabrous or nearly so ; leaflets rather thm, ovate oi subcordate at 

 n,„ u„c,„ _„+v.«,. i;,tV.+ rri-ooT.- ir^VioTiPs ohliniifilv nblanceolate. 4-o mm. long and 



about 2 'mm. wide. Copses and woodlands: N.S.— Fla.— Colo.— Sask. Plain 



■Subrnont. Je-Au. 



6. T. dioicum L. Stem 3-6 dm. high, slender; leaves 3-4 times ternate; 

 leaflets 1-3 cm. long, thin, pale beneath, rounded or sometimes cordate at the 

 base, with 3-9 rounded lobes; filaments filiform; achenes oblong, about 4 mm. 

 long. Woods: Lab.— Ala.— IMo.- Sask. Boreal. My-Je. 



6. T. venulosum Trelease. Stem 2-5 dm. high, glabrous; leaves 3^ times 

 ternate; leaflets rounded in outline, 5-15 mm. long, strongly veined, 3--o-lobed 

 and crenate, bluish green, paler beneath; panicle narrow and dense; falaments 

 filiform; achenes about 5 mm. long, oblong. T. campestre Greene. Open 

 mountain woods: Man. — Colo.— Utah. Plain— Mont. Je-Au. 



13* 



