THALICTRUM 



THALICTRUM 



3327 



obtuse: achenes many, long-stalked, reticulate, with 

 an incurved style. Himalayas, 8,000-12,000 ft. G.C. 

 III. 28:167. A handsome plant. 



4. Delavayi, Franch. Slender, 2-3 ft. high, glabrous: 

 lower Ivs. on long, slender petioles, 2-3 times 3-5- 

 parted: Ifts. long-stalked, 3-5-lobed, base cuneate, 

 rounded or cordate: fls. pendulous, dioecious; sepals 

 purple or lilac, Viva, long, equaling the slender stamens; 

 anthers linear: carpels 10-12: fr. winged at the 3 

 angles stipitate. Summer. Mountains of E. China. 

 B.M.7152. G.C. III. 8: 125; 38:450. G. 35:793. 



AA. Fr. striate edged or ribbed rather than winged, 

 sessile or essentially so in most species. 



B. Fls. probably perfect. 

 c. Filaments widened near the anthers, the latter ovate 



and obtuse. 

 D. Achenes sessile in a head, ovate-oblong. 



5. petaloideum, Linn. St. round, nearly 1 ft. high, 

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

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

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

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

 9:891. G. 28:625. 



DD. Achenes somewhat stalked, widely spreading, straight 

 on the dorsal margin. 



6. sparsiflSrum, Turcz. St. erect, sulcate, 2-4 ft. 

 high, branching, usually glabrous: Ivs. triternate, upper 

 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, perfect; sepals 

 obovate, whitish, soon reflexed; filaments somewhat 

 widened: anthers very short: achenes short-stalked, 

 obliquely obovate, flattened, dorsal margin straight, 

 8-10-nefved; styles persistent. N. Asia, through 

 Alaska to Hudson Bav, in mountains to Colo, and 

 Calif. 



cc. Filaments filiform or at least very slender; anthers 



linear, acute or mucronate. 



D. Stigma hastate or spurred. 



7. alpinum, Linn. Sts. smooth, naked or 1-lvd., only 

 4-8 in. high, from a scaly rootstock: Ivs. tufted at the 

 base, twice 3-5-parted; Ifts. coriaceous, orbicular or 

 cuneate at the base, lobed, reyolute: fls. in a raceme, 

 perfect; sepals greenish, equaling the yellow stamens; 

 stigma linear: achenes small, obliquely obovoid. 

 Northern and Arctic, and alpine regions of both Old 

 and New Worlds. B.M. 2237. 



DD. Stiffma not hastate or spurred. 



8. minus, Linn. {T. purpureum, Schang. T. saxdtUe, 

 Vill.). Sts. 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 polymorphous species in the variation of 

 the Ifts. 



Var. adiantifSlium, Hort. (T. adiantfndes, Hort. T. 

 adianthi folium, Bess.). Lfts. resembling those of adi- 

 antum fern. A form much used and admired. 



9. Purdomii, J. J. Clark. Much like T. minus, but 

 fls. larger, sepals acute or acuminate, the pedicels longer 

 and somewhat capillary: glabrous, the branches red- 

 dish green: Ivs. 2- or 3-pinnate, about 8 in. long, the 

 pinnas 3-5 pairs; Ifts. ovate, 3-lobed, membranaceous: 

 fls. small, greenish, pendulous, in lax panicles; sepals 4, 

 ovate-lanceolate, 3-nerved, acute or acuminate; sta- 

 mens about 14: carpels 5, sessile, 8-ribbed. N. China; 

 very recently described; cult, abroad. 



10. flavum, Linn. Stout, 2-4 ft., with furrowed st. 

 and creeping stoloniferous rootstock: Ivs. large, 2-3- 

 compound; Ifts. to \ l /z in. long, 3-lobed, obovate or 

 obcuneate: infl. compound and compact, the fls. erect 



and pale yellow (the anthers bright yellow); sepals 

 small: achenes 6-10, small, 8-ribbed. Eu. 



11. glaftcum, Desf. (T. speciosum, Hort.). Sts. erect, 

 round, glaucous, 2-5 ft. high: Ifts. ovate-orbicular, 

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

 perfect; sepals and stamens yellow: frs. 4-6, ovate, 

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



BB. Fls. dioecious or polygamo-diwcious. 

 c. Achene somewhat inflated, obovoid, and short-stalked. 



12. polycarpum, Wats. Aromatic, to 3 ft. high, 

 glabrous throughout; Ifts. long-stalked, ovate or 



roundish, serrate, cut or 

 divided, veined beneath: 

 fls. dioecious, in rather 

 close panicles; sepals 

 elliptic or ovate; stamens 

 16-25, with yellowish 

 anthers: achenes larger, 

 in a dense globose head, 

 short -stalked, obovoid, 

 turgid, tapering into 

 reflexed styles. Sandy 

 streams, coast ranges of 

 Calif . to Columbia River. 



cc. Achene flattened and 

 2-edged, nearly or 

 quite sessile. 



13. occidentile, Gray. 

 St. to 3H ft. high, bear- 

 ing 2 or 3 Ivs. which are 

 2-4-ternate and glandu- 

 lar-pubescent: Ifts. thin 

 and glaucescent, with 

 rounded lobes: achenes 

 long, slender, thin- 

 walled. 2-edged, ribbed, 

 not furrowed. Colo., 

 northward and west- 

 ward. 



14. Fendleri, Engelm. 

 Fig. 3790. Plant 1-3^ 

 ft. high, rather stout 



3790. Thalictrum Fendleri. ( X J*) and leafy: Ivs. 4-5 times 



pinnatifid, upper st.-lvs. 



sessile; Ifts. rather firm, ovate to orbicular, usually 

 with many shallow rounded or acuminate lobes; bases 

 variable: fls. dioecious, in rather compact panicles; 

 stamens many; anthers long: achenes nearly sessile, 

 obliquely ovate, flattened and 1 edge gibbous, 3-4 

 ribs on each face. July, Aug. S. Colo., westward and 

 southward. 



ccc. Achene ovoid, sessile or nearly so, striate or ribbed. 

 D. Filaments dub-shaped or dilated to nearly or quite 

 the width of the anthers. 



15. polygamum, Muhl. (T. Cornuti, Auth., not Linn.). 

 TALL MEADOW RUE. Erect, 3-8 ft. (or more) high, 

 branching and leafy, smooth or pubescent, not glandu- 

 lar: Ivs. 3-4 times ternate or terminally pinnate; Ifts. 

 oblong to orbicular, bases variable, 3-5 apical lobes: fls. 

 in a long, leafy panicle, polygamo-dioecious; sepals 

 white; filaments broadened when young; anthers short: 

 achenes ovoid, stipitate, 6-8-winged or -ribbed, with 

 stigmas as long, which become curled. July, Aug. Low 

 or wet grounds, Newfoundland and Canada to Fla., 

 westward to Ohio. 



DD. Filaments very slender, usually filiform. 



16. dasycarpum, Fisch. & Lall. (T. purpurdscens, 

 Auth., not Linn.). Stout and erect with purplish st., 

 3-7 ft. tall, leafy and branching: Ivs. 3-4-ternate; Ifts. 

 short-oblong and mostly 3-toothed, pubescent beneath 

 but not waxy or glandular: fls. mostly dioecious but 

 perhaps in some cases polygamous, with purplish 



