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. DECI>IENS 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. FLORENTINUM All. (KING 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. ven6sum 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. Grednii 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 tawny-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 (2Q-4()-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-torn eritose and commonly covered with numerous dark glands ; 

 heads 40-5Q-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, 6-16 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 din. 

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

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



