99 



scattered of 5 — 6 ray- and only 3 — 4 diskflowers; both 

 stipe and beak of ray-akenes very prominent and strongly 

 bent; pappus of disk-akenes mostly united at the base or even 

 to the middle, forming a tube. Very abundant, according 

 to the observation of Dr. Parry and myself from the 

 railroad cars throughout the region of the lower San 

 Joaquin, yet not appearing to have been collected except 

 by Dr. Kellogg, whose labels say „Near Antioch on dry 

 hills April 22d. 1870" and who referred the plant to 

 H. [asciculata, the more branching states of which it well 

 resembles, but the much larger size and different habitat, 

 and more especially the very prominent stripe of the 

 ray-akenes and the united scales of those of the disk 

 show it easely distinct. 



De plant werd half Juni 1904 tegelijk met de volgende 

 door Dr. J. Brand op het Contrescarpe te Doesburg 

 verzameld, vermoedelijk opgeslagen uit graanafval, afkom- 

 stig uit N. Amerika. 



26. Hemizonia pungens (Hook, et Arn.) Torr. et 

 Gray. = Centromadia pungens Greene wordtin Fl. N. 

 Am. II p. 399 door Torr. en Gray als No. 6 van § 4 

 als volgt beschreven: Herbaceous, somewhat ligneous at 

 the base; stem sparingly branched, setose with whitish 

 hairs; leaves crowded; the lower pinnatifid, with oblong 

 or oblong-lanceolate spinose-mucronate lobes, the upper 

 and those of the axillary fascicles linear, entire, rigid, 

 spinescent, the recurved margins papillose-hairy; heads 

 somewhat solitary, bracteate; scales of the involucre 

 spinescent, glandular, nearly equaUing the 2-cleft rays; 

 achenia of the ray gibbous, with a terminal very oblique 

 areola; receptacle wholly chaffy, the chaff lanceolate 

 subulate, spinescent. Deze soort is volgens Thellung ook 

 in Engeland en Zwitserland adventief waargenomen ^). 



^) In 1919 ook te Weert leg. Ver Straeten. 



