4 S2 



I ( )MPl (SITAE. 



Vol.111. 



12. Helianthus Maximiliani Schrad. Maxi- 

 milian's Sunflower. Fig. 4472. 



Helianthus Maximiliani Schrad. Ind. Sem. Hurt. Goctt. 

 1835- 



Perennial by fleshy roots and thickened rootstocks ; 

 stems stout, scabrous or hispid below, 2-i2 high. 

 Leaves sessile or short-petioled, long-lanceolate, fold- 

 ing in drying, alternate or the lower opposite, very 

 rough en both sides, rigid, acuminate or acute at 

 both ends, denticulate or entire, 3'-/' long, k'-l\' 

 wide; heads few or numerous, 2'-3' broad on stout 

 densely rough-pubescent peduncles ; involucre hemi- 

 spheric, its bracts lanceolate, acuminate, squarrose, 

 densely strigose-pubescent. often 9" long; disk yel- 

 lowish; rays 15-30; chaff linear, acute, pubescent 

 above ; achenes linear-oblong, glabrous or nearly so ; 

 pappus commonly of 2 lanceolate awns. 



On dry prairies, Minnesota and Manitoba to Sas- 

 katchewan, Missouri, Nebraska and Texas. Locally 

 adventive eastward. Aug.-Oct. 



13. Helianthus Dalyi Britton. Judge 

 Daly's Sunflower. Fig. 4473. 



Helianthus DalyH Britton, Journ. N. Y. Bot. 

 Card. 2 : 89. 1901. 



Perennial by a fusiform tuber l'-i3' 

 long; stem slender, simple, roughish, ap- 

 pressed-pubescent, about 2 high. Leaves 

 firm, conduplicate, drooping, finely rough- 

 pubescent on both sides, narrowly lanceo- 

 late, acuminate at both ends, distantly ser- 

 rate with low teeth, the larger about 4' 

 long and 7" wide, all opposite or the up- 

 permost alternate; heads usually solitary 

 and long-peduncled, rarely 2, about 3*' 

 broad ; involucral bracts narrowly lanceo- 

 late with long subulate tips; rays acute; 

 pappus 2 subulate awns; chaff of the re- 

 ceptacle pubescent at the acute apex. 



On a dry bank. Sag Harbor, New York. Sept. 



14. Helianthus subtuberosus Bourgeau. 

 Indian Potato. Fig. 4474. 



H. giganteus subtuberosus (Bourgeau) Britton, in 

 Britt. & Brown, 111. Fl. 3: 425. 1898. 

 . H. subtuberosus Bourgeau; Britton, Manual 993. 

 1 90 1. 



Fleshy roots, thick and edible. Leaves thick, 

 more or less serrate, all or all but the upper dis- 

 tinctly petioled, sometimes all opposite. 2Y-5' 

 long, acuminate at the apex, mostly narrowed at 

 the base, the petioles ciliate ; heads not very nu- 

 merous ; bracts of the involucre lanceolate, acumi- 

 nate, densely pubescent and white-ciliate, about 

 8" long; rays r'-lf long. 



Dry soil, Michigan and Minnesota to Saskatche- 

 wan, Montana and Wyoming. Aug.-Sept. 



Helianthus Rydbergi Britton. of western Ne- 

 braska, differs by broader, ovate-lanceolate leaves, 

 rather abruptly narrowed at the base. 



