COMP08ITAE QCOMPOSITB FAMILY) 



867 



etc.; leaves broadly oblanceolate or even obovate, unlobed, pale beneath, acumi- 

 nate, sagittate at base, some or all ratlier Jiriely siniiate-touthed, the upper 

 usually entire or nearly so. — Rich thickets, etc., e. Mass. to Ind. 



6. L. sagittifblia Ell. Tall and stout, glabrous, very leafy ; leaves thickisli. 

 broadly oblong or lance-oblong, acute, strictly entire or merely a little toothed 

 on the broad and conspicuous amplexicaul auricles of the sagittate base ; inflo- 

 rescence, etc., as in nos. 3 and 4. (X. integrifolia Man. ed. 6, in part.) — Rich 

 soil. Pa. to S. C. 



•♦- ■*- Leaves hirsute or hispid-setose on the midnerve beneath. 



*+ iStem leafy chiefly at or below the middle; bracts of the inflorescence minute^ 

 subulate ; slender eastern and southern species. 



6. L. hirsuta Muhl. Rather few-leaved, 0.5-1 m. high, 

 commonly hirsute at base ; leaves hirsute on both sides or only 

 on the midrib, mostly runcinate-pinnatifid, with rather narrow 

 rhachis and lobes; heads slender and elongated, in a loose 

 open panicle ; achenes elliptic-oblong, equaled by the beak ; 

 flowers yellow-purple, rarely whitish. — Dry 

 open ground, Que. to La. and Tex. Fig. 

 1020. 



1020. L. hirsuta. 



<*■*■ •»-«• Stem more uniformly leafy ; bracts at 

 the base of the inflorescence somewhat 

 foliaceous; stout species of the interior. 



7. L. ludovici^na (Nutt.) Riddell. Tall and stout, 0.5- 

 1.5 m. high, leafy ; leaves sinuate-pinnatifid, the rhachis and 

 spinulose-toothed lobes rather broad ; heads large, ovoid, in io21. L. ludoviciana. 

 an open panicle; the involucre much imbricated, 1.6-2 cm. 



long \ flowers yellow. — Minn., la., and southwestw. Fig. 1021. 



8. L. campestris Greene. Closely similar to no. 7, h\ii flowers blue. — Prai- 

 ries, s. Minn, to Kan. — Perhaps only a color form of the preceding. 



*** Heads about \8-floicered; achenes lanceolate, S-ribbed on each face., nar- 

 row-margined, 3-4 times exceeding the beak. 



9. L. M6rssii Robinson. Very leafy, somewhat hirsute below, 1-3 m. high ; 

 leaves runcinate-pinnatifid, mostly 5-lobed, 1.2-2 dm. long, half as broad, on 



broadly winged clasping petioles, the lower somewhat hirsute 

 beneath on the midrib, etc. ; panicle ample ; involucre about 1 cm. 

 long ; flowers blue ; achene black, mottled with brown ; pappus 

 cream-colored in drying. — Rich low ground, Me. and Mass.; also 

 reported from n. N. Y. Fig. 1022. 



§2. LACTUCASTRUM Gray. Achenes flat, lanceolate-oblong, 

 marginless, tapering to a short slender firm beak; perennial; 

 1022. L. Morssil. ./^oioers blue. 



10. L. Ste^lei Britton. Tall and stout ; leaves ovate-oblong to 

 broadly lanceolate, doubly dentate but unlobed, acuminate, hin^ute upon the 

 midnerve and principal veins beneath, narrowed at the base to 

 rather long and winged petioles ; heads in an open panicle ; 

 flowers bluish-purple ; achenes lanceolate, 3-ribbed on each 

 surface, the margin slightly thickened. — Open woodland, n^ar 

 Washington, D. C. (Steele). 



11. L. pulch611a (Pursh) DC. (Bluk L.) Pale or glau- 

 cous ; stem simple, 1 m. or less high ; leaves sessile, glabrous, 

 oblong- or linear-lanceolate, entire, or the lower runcinate- 

 pinnatifid; heads few and large, racemose, erect on scaly- 

 bracted peduncles ; involucral bracts imbricated in 8-4 ranks. 

 — Upper Mich, and Ont., westw. and soutl'W. Fig. 



lO.'.S. L. i>ulchella 



1023. 



