CARDUACEAE 1259 
or linear-oblong, 1-2 cm. long : ray-flowers 12-20 ; ligules 2-3.5 em. 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 ampléctens 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 divérgens 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 theinvolucre 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 serícea T. V. Moore. Stems 5-12 dm. tall, simple or branched, more 
or less hispid: leaf-blades linear to linear-lanceolate, elongated, 6-15 em. long, remotely 
toothed or entire, strigose-pubescent ; those of the basal and lower cauline leaves petioled, 
broader tlian 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 lóngipes 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 Brittónii 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 em. 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, ud 
em. long, serrate or entire ; those of the upper leaves sessile and partly clasping by broa 
bases: heads showy : bracts of the involucre linear to linear-lanceolate, 1-1.5 em. 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. 
s NS woods, in or near the mountains, Pennsylvania to Georgia, Tennessee and Alabama. Summer 
nd fall. 
38. Rudbeckia Floridàna T. V. Moore. Stems 3-6 dm. tall, simple or branched, 
hispid : leaf-blades oblong to oblong-lanceolate, spatulate or broadly linear, 3-9 "E es 
usually serrate-dentate, scabrous or hispid, those of the cauline leaves ben on en 
petioles, or the uppermost sessile and often partly clasping : heads small : s ucra T: 
oblong to linear-oblong, 6-10 mm. long: ray-flowers 8-12; ligules 1-2 cm. tee ye er 
fading greenish: disks mostly less than 1 cm. in diameter, hemispheric: chaff pointed, 
ciliate at the tip: pappus none. 
i i i .— iety, R. Floridana angustifolia 
In sandy soil, Florida to Arkansas and Texas. Spring to fall.—A varie 
- V. Moore, r^ distinguished by its more slender habit and narrower leaves. 
