SUNFLOWER FAMILY 117 
A genus of about 25 species, all North American. Type species, Rudbeckia laciniata L. 
Rays present. 
Disk purple-brown; stem densely spreading-hispid or -hirsute throughout; pappus none. 
ie R. hirta pulch 
Disk ish yellow; stem glab ptt d apex; pappus present. 2. R. californica. 
Rays wanting. 
Disk greenish yellow; leaves, except the uppermost, pinnately 3—9-lobed or -parted. e 
= al 
Disk purple-brown; leaves entire or merely serrate. ots pie sc 
1. Rudbeckia hirta var. argeu ey Farwell. Black-eyed Susan. Fig. 5164. 
oe hirta L. Sp. be 907. 1753, in par 
Rudbeckia serotina Nutt. Journ. Acad. Phila. og: 1834. 
Rudbeckia hirta var. Heute Farwell, Rep. ‘ex: Acad. 6: 209. 1904. 
Biennial or short-lived perennial, 3-10 dm. high, often several-stemmed, the stems erect, 
imple or branched, reddish at the base and spotted with red above, rather slender, spreading- 
bees and also hispid. Lower leaves ovate, obovate, or nae ly acute or obtuse, contracted 
into margined petioles, entire or serrate, triplinerved, hirsute or hispid, rather thin, 8-25 cm. long 
a ding the petiole; stem-leaves obovate to ma pi vi ye or sessile, rigpatig Fate 
somewhat clas ASDHE gradually | reduced above; heads 1 t ral, 4-7 cm. wide, borne on long 
peduncles; involucre 8-25 m cae phyllaries near or ues olate, a ea ‘densely 
irsute, soon iene the oon sometimes enlarged; rays about 14, golden yellow, 2-4 cm. lon 
disk about 1.5 cm. thick, purple-brown, sabetobeses bhphants ng low-conic; receptacle bluntly 
5164 
5162. Helianthus nuttallii 
5163. Helianthus californicus 
