THALICTBUM 



cc. Fruits longitudina II ij 

 veined: stigma terminal, 

 minute, not dilated, style 



short i. glaucum 



AA. Fls. polygamo-diacious. 



B. Anthers linear, mucronate: 



filam.ents thread-like 5. purpurascens 



BB. Anthers ovate: obtuse, fila- 

 ments broadened above G. polygamum 



AAA. Fls. dioecious, with rare exce])- 

 tions. 

 B. Filaments widened above: 



anthers ovate, rather obtuse. 7. aquilegifoliun 

 BB. Filaments thread-like: an- 

 thers linear, acute or mu- 

 cronate. 

 0. Mature fruits rather firm 

 or thick-walled, not 

 greatly flattened, filled by 

 the seed. 

 D. Sepals green or greenish. 

 E. Blades of leaflets very 



thill 8. dioicum 



EE. JBIadi-n nf Inifhlx fn-iii. 



vein 11 h, i,,ir ',1. venulosum 



DD. Sepals ]iiirjilf 10. Delavayi 



CO. Mature frails less finii. 

 thin - walled, 2 -edged, 

 either flattened or turgid. 



D. Leaflets very thin 11. occidentale 



DD. Leaflets firm. 



E. Pistils 5-ll(rarely IS): 



akenes flattened 12. Fendleri 



EE. Pistils 7- SO: akenes 



turgid 1.3. polycarpum 



1. petaloideum, Linn. Stem round, nearly 1 ft. high 

 almost naked: Ivs. 3-5-parted; Itts. smooth, ovate, en 

 tire or 3-lobed: fls. corymbose, perfect; sepals white 

 rotund; filaments pink; anthers yellow: fr. ovate-ob 

 long, striated, sessile. June, July. N. Asia. L.B.C 

 9:891. — Not yet in American trade lists but well worth 

 cultivating. 



2. sparsiJldruni, Turcz. Stem erect, sulcate, 2-4 ft. 

 high, branching, usually glabrous : Ivs. triternate, up- 

 per ones sessile; Ifts. short-stalked, round or ovate, 

 variable in size and shape of base, round-lobed or 

 toothed: fls. in leafy panicles on slender pedicels, per- 

 fect; sepals obovate, whitish, soon reflexed; filaments 

 somewhat widened; anthers very short: akenes short- 

 stalked, obliquely obovate, flattened, dorsal margin 

 straight, 8-10-nerved; styles persistent. N. Asia, 

 through Alaska to Hudson Bay, in mountains to Colo- 

 rado and southern California. 



3. minus, Linn. {T.pnrpfireum, Schang. T. saxdtile, 

 Vill.). Stems round, sulcate, 1-2 ft. high: Ifts. variable, 

 acute or obtusely lobed, often glaucous: fls. drooping, 

 in loose panicles, perfect; sepals yellow or greenish: 

 fr. ovate-oblong, sessile, striated. Summer. Eu., Asia, 

 N. Afr. — A polvmorphous species in the variation of 

 the leaflets. 



Var. adiantif61ium, Hort. (T. adiantoides, Hort. T. 

 adiaiilhifdlium, Bess.). Lfts. resembling those of Adi- 

 antum fern.— A form much used and admired. 



4. glaticum, Desf. {T. specidsum, Hort.). Stems 

 erect, round, glaucous, 2-5 ft. high: lfts. ovate-orbicu- 

 lar, 3-lobed ; lobes deeply toothed : fls. in an erect 

 panicle, perfect; sepals and stamens yellow: fruits 4-6, 

 ovate, striated, sessile. June, July. 'S. Eu. 



5. purpuriseens, Linn. {T. purpureum, Hort.). A 

 polymorphous species, allied to T. polygamum: stem 

 3-6 ft. high, branching above, leafy, pubescent or 

 glabrous, sometimes glandular: lfts. larger than in that 

 type: fls. in a long, loose, leafy panicle, polygamo-dice- 

 cious; filaments narrow; anthers rather long, taper- 

 pointed: akenes slightly stalked, ovoid, glabrous or 

 pubescent, with 6-8 longitudinal wings; style slender, 

 persistent; stigma long and narrow. Canada to Fla., 

 west to the Rockies. June-Aug. 



6. polygamum, Muhl. Tall Meadow Rue. Erect, 

 3-8 or more ft. high, branching and leafy, smooth or 



THALICTRUJI 



1791 



pubescent, not glandular: Ivs. three to four times ter- 

 nate or terminally pinnate; lfts. oblong to orbicular, 

 bases variable, 3-5 apical lobes: fls. in a long, leafy 

 panicle, polygamo-dicecious; sepals white; filaments 

 broadened when young; anthers short: akenes ovoid, 

 stipitate, 6-8-winged or ribbed, with stigmas as long, 

 which become curled. July, Aug. Low or wet grounds, 

 Canada to Fla., westward to Ohio. 



7. aquilegUdlium, Linn. Feathered Columbine. 

 Fig. 2493. Stems large, hollow, 1-3 ft. high, glaucous: 

 Ivs. once or twice 3-5-parted ; lfts. stalked or the lateral 

 ones nearly sessile, slightly lobed or obtusely toothed, 

 smooth, suborbicular: fls. in a corvnibose panicle, 



■ or white: fr. 



-luly. Eu., N. 



■//). Gn. 47, p. 



I-,inn., may be a 



ime, being pub- 

 was described 



dicecious; sepals white: >^ him r 



3-angled, winged at tin !. -i i ,| 



Asia. B.M. 1818; 2025 i :i , „„/ 



357; 50,p.ll7.-Theoldii,Mi.,. ,' . ,,l 



synonym of this, and if buii i-^ iliu ■ lui i n:Li 



lished on a preceding page, but 'J'. Cuniuti 



as an American plant, while T. aqiiilegi folium is not. As 



the description and old figure of T. Vormiti do not 



agree with any American plant, the name may well be 



dropped. Those plants advertised as T. Cormiti are 



probably T. aqnilegi folium or 'JC. polygamum. 



8. didicum, Linn. Rather slender, 1-2 ft. high, gla- 

 brous: Ivs. three to four times 3-parted; lfts. thin, 

 orbicular, several-lobed or revolute, bases variable : 

 fls. in a loose, leafy panicle with slender pedicels, di- 

 cecious; stamens much longer than the greenish sepals; 

 anthers linear, obtuse, exceeding their filaments in 

 length: akenes ovoid, nearly or quite sessile, longer 

 than their styles with about 10 longitudinal grooves. 

 Early spring Woods, L ibrador to Ala , west to the 

 foot of the Rockies 



9. venuldsum Ti 1 i MIi 1 t / <linicxim: stem 

 simple, erect 1 i i i i i mcous, bear- 

 ing 2-3 long I 1 



rounded and III i i 

 simple panicle li i u 

 10-20, on slender filau 

 pointed akenes ne n 

 tapering to a straight 

 S. Dak westward and < 



rather firm, 

 ath fls. in a 

 ite stamens 

 ng, slender- 

 long, ovoid 

 and 2-edged. 



2493. Thalictrum aquileeifolium (X K). 



10. Delav&yi, Franchet. Slender, 2-3 ft. high, gla- 

 brous : lower Ivs. on long, slender petioles, two to three 

 times 3-5-parted ; lfts. long-stalked, 3-5-lobed, base 

 cuneate, rounded or cordate: fls. pendulous, dioecious; 

 sepals purple or lilac, K in. long, equaling the slender 

 stamens, anthers linear: carpels 10-12: fr. winged at 



