CAKDUACEAE 1259 



or linear-oblong, 1-2 cm. long : ray-flowers 12-20 ; ligules 2-3.5 cm. long, yellow or orange : 

 disks ovoid or conic, 10-18 mm. wide : chaff pointed, ciliate at the tip : pappus wanting. 

 In woods and fields, Quebec to Florida, Oklahoma and South Dakota. Summer and fall. 



32. Rudbeckia ampl<ctens T. V. Moore. Stems 3-6 dm. tall, simple or sparingly 

 branched, hispidulous : leaf-blades entire or remotely denticulate, appressed-pubescent, 

 mostly acute, 2-8 cm. long, those of the lower stem-leaves elliptic-lanceolate, contracted 

 into broad, winged petioles, the upper oblong, sessile by a subcordate, clasping base : heads 

 showy : involucral bracts 8-14 mm. long, linear-oblong or linear-lanceolate : ray-flowers 

 8-12 ; ligules 1-2 cm. long, yellow : disk hemispheric or short-conic : chaff pointed, ciliate 

 at the tip : pappus none. 



In dry soil, South Carolina and Georgia. Summer. 



33. Rudbeckia divergens T. V. Moore. Stems 3-10 dm. tall, divergently branched, 

 usually from near the base, hirsute or hispid : leaf- blades strigose-hirsute ; those of the 

 basal leaves oblanceolate, petioled, remotely toothed ; of the lower stem-leaves oblong to 

 lanceolate, remotely serrate-denticulate or entire : the upper oblong to lanceolate or almost 

 linear, serrate-denticulate or entire, sessile and often slightly clasping : peduncles usually 

 elongated : heads showy : bracts of the involucre linear or linear-lanceolate, 6-11 mm. long: 

 ray-flowers 8-14; ligules 1.5-3 cm. long, yellow or with a darker base, fading greenish : 

 disks 12-18 mm. broad, hemispheric : chaff pointed, ciliate at the tip : pappus none. 



In pine woods and fields, South Carolina to Florida, near the coast. Spring and summer. 



34. Rudbeckia sericea T. V. Moore. Stems 5-12 dm. tall, simple or branched, more 

 or less hispid : leaf-blades linear to linear-lanceolate, elongated, 6-15 cm. long, remotely 

 toothed or entire, strigose-pubescent ; those of the basal and lower cauline leaves petioled, 

 broader than the sessile upper stem-leaves : heads showy : bracts of the involucre 1-2 cm. 

 long, linear to oblong-linear or lanceolate : ray-flowers 10-15 ; ligules yellow, 2-4 cm. long : 

 disks 12-20 mm. wide, ovoid-conic : chaff relatively long and narrow, pointed, ciliate at 

 the tip ; pappus wanting. 



In dry woods and fields, South Dakota to Missouri, Alabama and Georgia. Summer. 



35. Rudbeckia Idngipes T. V. Moore. Stems 3-10 dm. tall, simple or branched, 

 hispid : leaf-blades lanceolate, hispid ; those of the basal leaves 6-20 cm. long, remotely 

 toothed, tapering at both ends, borne on long, slender petioles, sometimes 2 dm. long ; the 

 upper reduced in size, sessile or short-petioled, toothed or entire : heads showy : bracts of 

 the involucre linear-lanceolate to oblong-lanceolate, 1-2 cm. long : ray-flowers 10-14 ; lig- 

 ules 2-3.5 cm. long, yellow : disks short-conic, about 1.5 cm. broad : chaff pointed, ciliate 

 at the tip : pappus none. 



In woods and fields, New York to Iowa and Alabama. Summer and fall. 



36. Rudbeckia Brittonii Small. Stems 5-8 dm. tall, simple or branched, hispid or 

 hirsute-hispid : leaf-blades various ; those of the basal leaves ovate, 8-12 cm. long, with 

 broad petioles ; those of the stem-leaves ovate, ovate-lanceolate or elliptic, toothed or rarely 

 lobed, short-petioled or sessile and partly clasping : heads showy : bracts of the involucre 

 oblong to lanceolate, 1-3 cm. long, often foliaceous : ray-flowers 10-14 ; ligules yellow, 

 2.5-3.5 cm. long: disks hemispheric to short-conic, 1-2 cm. broad: chaff pointed, ciliate 

 at the tip : pappus none. 



On mountain slopes, Virginia to North Carolina, Tennessee and Alabama. Summer. 



37. Rudbeckia monticola Small. Stems 3-10 dm. tall, simple or branched, more or 

 less densely hirsute or hispid : leaf-blades ovate, ovate-lanceolate, oval or elliptic, 5-10 

 cm. long, serrate or entire ; those of the upper leaves sessile and partly clasping by broad 

 bases: heads showy: bracts of the involucre linear to linear-lanceolate, 1-1.5 cm. long: 

 ray-flowers 10-14 ; ligules yellow, 2-3.5 cm. long : disks hemispheric or ovoid, 12-18 mm. 

 broad : chaff pointed, ciliate at the tip : pappus wanting. 



In woods, in or near the mountains, Pennsylvania to Georgia, Tennessee and Alabama. Summei 

 and fall. 



38. Rudbeckia Floridana T. V. Moore. Stems 3-6 dm. tall, simple or branched, 

 hispid : leaf-blades oblong to oblong-lanceolate, spatulate or broadly linear, 3-9 cm. long, 

 usually serrate-dentate, scabrous or hispid, those of the cauline leaves borne on winged 

 petioles, or the uppermost sessile and often partly clasping : heads small : involucral bracts 

 oblong to linear-oblong, 6-10 mm. long : ray-flowers 8-12 ; ligules 1-2 cm. long, yellow, 

 fading greenish : disks mostly less than 1 cm. in diameter, hemispheric : chaff pointed, 

 ciliate at the tip : pappus none. 



In sandy soil, Florida to Arkansas and Texas. Spring to fall. A variety, R. Floridana angusttfolia 

 T. V. Moore, is distinguished by its more slender habit and narrower leaves. 



