Joepyeweed (Eupatorium)

Groups:

..... lvs in whorls of 3-7 not whorled: .....
..... ..... divided: entire or toothed
1)fls not white Group I ..... Group II
1)white ..... ..... .....
6) fls us at least 9 per head ..... ..... Group III
6)fls most 5 per head, rarely 3-7 ..... Group IV .....
15) invol bracts acuminate to attenuate (tapering to a short tip) ..... ..... Group V
15) invol bracts rounded to acute, but scarcely acuminate ..... ..... .....
17) lvs broadly cuneate or subtruncate to rounded or subcordate at base ..... ..... Group VI
17) lvs tapering to a narrow base ..... ..... Group VII

Group I

..... long-pointed, lance-shaped elliptical egg-shaped
fls 10-16 per head; stem purple or purple-spotted; purple fls spotted jpw (1.maculatum) flattish flwr cluster; lv singl main vein; moist pls, esp in calcareous soils; NF to MD, WV ..... eastern jpw (2.dubium) stem finely spotted purple; lves w/ 3 main veins; moist pls, esp in sandy or gravelly, acid soil, near the coast; NS to SC
fls 4-7 per head; stem with whitish bloom; purple or pink fls ..... trumpetweed (5.fistulosum) hollow stem; blunt teeth; lvs w/ single main vein; bottomlands & moist woods; s ME to FL .....
stem w/ purple joints; pale pink flowers ..... sweet-scented jpw (4.purpureum) stem solid; vanilla scented when bruised; lvs pointed at both ends; thickets & open woods, often in drier habitats; s NH to VA & in mts to GA .....

Group II

..... lvs petiolate, egg-shaped
receptacle conic; us blue fls (6.coelestinum) lvs deltoid-ovate; woods, streambanks, meadows & fields; NY to FL to TX
receptacle flat; pink-purple fls pink eupatorium (7.incarnatum) X; deltoid or ovate lvs; woods, ditch banks & swamps; WV to se VA to FL

Group III

..... sessile:   petiolate:  
..... lanceolate broader lanceolate egg-shaped
9) invol bracts not strongly imbricate ..... ..... ..... .....
10) lf blade obviously longer than the petiole, not extremely thin & delicate ..... ..... ..... .....
11) lvs relataively thick & firm, mostly crenate ..... ..... ..... smaller w.s.r (8.aromaticum) dry woods, esp in sandy soil; MA to FL
9) invol bracts ev. imbricate ..... ..... ..... .....
12) lvs evidently petiolate ..... ..... late-flowering w.s.r. (11.serotinum) broadly lance-shaped lvs .....
12) lvs sessile ..... ..... ..... .....
13) lvs neither esp broad at base nor at all connate pine barren eupatorium (12.resinosum) pocosins, bogs & other wet pls in the pine-barrens; NJ to DE & rarely NC ..... ..... .....
13) lvs coarsely toothed or w/ numerous teeth ..... boneset (13.perfoliatum) lvs merged; stem hairy; moist or wet low grounds; NS & QE to n FL ..... .....

Group IV

dog-fennel (14.capillifolium) open pls, often in old fields & pastures, coastal states; NJ to FL to TX & s AK

Group V

............... OE OT or OE
............... elliptic to elliptic ovate lance-oblong to linear oblong to oblanceolate
............... white b.s. (15.album) lvs almost elliptical; stem hairy; dry, open woods, esp in sandy pinelands; s CN to c FL white-bracted b.s. (16. lleucolepis) wet, sandy or peaty soil near the coast; MA to FL

Group VI

..... OT lance egg-shaped oblong
18) lvs glabrous below the infl upland boneset (17. sessilifolium) woods, esp in sandy soil; NH to GA ..... .....
18) plants evidently hairy below as well as in the infl ..... ..... .....
19) lvs strictly pinnately veined (18.godfreyanum) woods & disturbed, open sites, us in less acid soil than #17 ..... .....
19) lvs evidently tri-nerved or triplenerved from near the base ..... ..... ......
20) lvs ovate to subrotund ..... hairy boneset (19.rotundifolium v ovatum) stem hairy round-leaved boneset (19.rotundifolium) stem hairy
21) lvs narrower ..... rough boneset (20.pilosum) stem hairy, chiefly in wet soil: MA to FL .....

Group VII

..... all opp or upper alt mostly alt or quaternate
lvs most 2.5-7 times as long as wide, the larger ones seldom less than 1 cm wide, all opposite, or the upper alternate tall boneset (24.altissimum) woods, thickets, savannas, glades & clearings; NJ & PA to SC .....
lvs most 6-40 times as long as wide, seldom over 1 cm wide, mostly alternate or quaternate ..... hyssop-leaved boneset (25.hyssopifolium) fields & other open pls, esp in dry, sandy soil; coastal states; MA to n FL