COMPOSITAE (COMPOSITE FAMILY) 873 



* Rootstock short, stout, praemorse. 

 - Heads small, 1-2.3 cm. in diameter. 



** Inflorescence a corymbiform panicle (sometimes subcylindric in no. 11, which 



has leafy bracts). 



Leaves, (at least those of the primary axis) chiefly basal. 

 a. Leaves narrowly oblanceolate or spatulate, glaucous. 



5. H. PRAEALTUM Gochnat, var. DEC* PIENS Koch. Somewhat glaucous, bear- 

 ing numerous slender elongated leafy branches from the base; basal leaves 

 narrowly oblanceolate to linear-oblong, somewhat hispid on both surfaces and 

 finely stellate-pubescent beneath ; scape tall, setose ; corymb irregular ; flowers 

 yellow. Established in a dry pasture, Andover, Mass. (A. S. Pease). June. 

 (Adv. from Eu.) 



6. H. FLORENxlNUM All. (KINO DEVIL.) Without slender leafy branches 

 from the base, smoothish ; basal leaves oblanceolate to spatulate, thickish, 

 sparingly setose or more often glabrous; scape 3-8 dm. high, smooth or spar- 

 ingly setose ; corymb many-headed. (H. praealtum Man. ed. 6, not Gochnat.) 

 Open places, fields, etc., e. Que. to n. N. Y. (Nat. from Eu.) 



b. Leaves elliptic-oblong. 



7. H. venbsum L. (RATTLESNAKE-WEED, POOR ROBIN'S PLANTAIN. ) Scape 

 2-7 dm. high, naked, or with 1 rarely 2 leaves (var. SUBCAULESCENS T. & G.), 

 smooth, slender, forking above into a loose corymb ; leaves nearly entire, 

 scarcely petioled, thin, glabrous and often purple-veined or mottled above, 

 glaucous beneath ; pedicels very slender, sparingly glandular-pubescent toward 

 the tip. Dry woods and open sandy places, s. Me. to Ga., and westw. Late 

 May-Sept. 



8. H. GreSnii Porter & Britton. Scape 2-7 dm. high, usually spreading- 

 villous especially below, naked or more often with 1-2 leaves near the base ; 

 leaves spatulate to obovate, green, conspicuously sordid- or taicny-villous on 

 both surfaces; inflorescence copiously glandular-hispid. (H. marianum, var. 

 spathulatum Gray.) Dry woods, Pa. and O. to Mo., and southw. 



= = Stem leafy to the inflorescence. 



9. H. paniculatum L. Stem slender, 3-12 dm. high, glabrous except at the 

 villous base ; leaves thin, lanceolate, remotely toothed, acute, glabrous, glaucous 

 beneath; panicle lax; heads comparatively small (12-20-flowered), on filiform 

 smoothish pedicels. Open woods, N. S. and centr. Me. to Mich., s. to Ga. and 

 Ala. Late July-Sept. 



10. H. marianum Willd. Stouter ; stem setose at least below ; leaves obo- 

 vate-oblong, obtuse or rounded at tip, subentire; the basal large, on hairy 

 winged petioles, green or rarely purple-veined, glabrous above, hairy on the 

 veins beneath; panicle open, corymbiform; heads larger (20-4Q-flowered) , on 

 whitish-tomentose and glandular-hispid pedicels. Open woods and clearings, 

 N. H. to O., and southw. June-Aug. 



11. H. scabrum Michx. Stoutish, 3-12 dm. high, rough-hairy ; leaves elliptic 

 to spatulate-obovate, obtuse, subentire, thickish, hairy on both surfaces, deep 

 green above, paler beneath ; panicle stiff, corymbiform, its axis and branches 

 densely white-tomentose and commonly covered with numerous dark glands ; 

 heads 40-50-flowered, on thickish pedicels. Dry woods and pastures, frequent. 

 July-Sept. 



+- ++ Inflorescence more slender and elongated, subcylindric, not leafy-bracted. 



12. H. Gronbvii L. Stem wand-like, 3-12 dm. high, leafy chiefly below the 

 middle, villous at base ; basal leaves oblong to obovate, 5-15 cm. long, rounded 

 or obtuse at the tip, setose chiefly above, minutely stellate-pubescent beneath ; 

 the stem-leaves similar, decreasing rapidly in size ; panicle thyrsoid, 1-4 dm. 

 long, without leafy bracts; heads 15-20-flowered, on slightly glandular pedi- 

 cels. Sandy soil, Mass, to Ont., Kan., and southw. Aug.-Oct. 



