CAKDUACEAE 1279 



26. Coreopsis gladiata Walt. Perennial. Stems erect, 6-12 dm. high, terete or 

 slightly angled, striate, branched above, glabrous : leaves mostly alternate, the basal and 

 lower stem-leaves petioled, their blades entire, elliptic-oblong to oblanceolate, 1-2 cm. 

 broad, rounded at the apex ; upper stem-leaves with sessile blades, abruptly reduced to 

 small scales : heads 4-6 mm. broad including the rays : outer involucral bracts broadly tri- 

 angular, 3-4 mm. long, the inner ovate-lanceolate, 9-12 mm. long : ligules obovate, 3-lobed 

 at the apex, the middle lobe rounded or more commonly notched : chaff of the receptacle 

 linear, acute : achenes elliptic-oblong, about 3.5 mm. long, with a lacerate marginal wing : 

 pappus a pair of slender awns. 



In wet soil, North Carolina to Florida. Fall. 



27. Coreopsis integrifolia Poir. Perennial. Stems erect, 6-9 dm. high, round or 

 somewhat angled and corymbosely branched above, striate, leafy throughout : leaves oppo- 

 site ; blades entire, glabrous at maturity, the margins and midrib as well as the edges of 

 the petioles, ciliate, at least when young, basal and lower stem-leaves petioled, their blades 

 ovate, acute ; of the upper stem-leaves short-connate, petioled or sessile, ovate to elliptic- 

 oblong, gradually reduced in size upward : heads 3-4 cm. broad including the rays : outer 

 involucral bracts oblong, 4-6 mm. long, obtuse, ciliate ; the inner about twice as long as the 

 outer, ovate, bluntly pointed : ray-flowers about 8 ; ligules obovate, 3-lobed at the apex. 



In moist soil, Georgia and Florida. Fall. 



28. Coreopsis helianthoides Beadle. Perennial. Stems erect, 5-12 dm. high, gla- 

 brous, furrowed, freely branched above the middle : leaves alternate, sparingly pubescent 

 with jointed hairs ; blades of the basal and lower stem-leaves long-petioled, entire, ovate 

 to ovate-lanceolate, 2-6 cm. broad, acute, scarious-margined ; blades of the upper stem- 

 leaves abruptly reduced, becoming mere scales on the branches : heads 3-4 cm. broad 

 including the rays : outer involucral bracts lanceolate, 5-9 mm. long, the inner ovate, 8-12 

 mm. long : ray-flowers about 8 ; ligules 3-lobed, the middle lobe rounded or notched : 

 achenes oblong-spatulate, about 3 mm. long, bordered by a narrow irregularly pectinate 

 wing : pappus a pair of short awns. 



In low grounds, southern Georgia and northern Florida. Fall. 



29. Coreopsis nudata Nutt. Perennial, glabrous throughout. Stems erect, 6-12 

 dm. high, terete, flexuous, striate, corymbosely-branched near the summit : leaves terete, 

 rush-like ; the basal and lower stem-leaves 7-30 cm. long, the upper stem-leaves subulate, 

 minute : heads 4-6 cm. broad including the rays : outer involucral bracts lanceolate, 4-6 

 mm. long, the inner ovate, about 1 cm. long : ligules pink, obovate-cuneate, with three 

 rounded lobes at the apex : achenes oblong-elliptic, about 3 mm. long, bordered by an 

 irregularly lacerate wing : pappus a pair of minute awns. 



In wet pine lands, southern Georgia and Florida. Spring and summer. 



105. BIDENS L. 1 



Erect branching herbs, ours all annual or biennial. Leaves opposite, or the upper 

 sometimes alternate : blades simple or divided. Heads numerous, radiate or rarely dis- 

 coid, each with a double involucre, the outer one foliaceous, the inner scarious and appressed. 

 Receptacle flat or nearly so, chaffy. Ray-flowers neutral, the ligules white or yellow. 

 Disk-flowers perfect, fruit-producing. Achenes firm, flat, 4-angled or nearly terete, beak- 

 less. Pappus of 2-4 rigid barbed awns or teeth, or rarely none. BEGGAR-TICKS. BUR- 

 MARIGOLD. 



Achenes spindle-shaped, gradually tapering above : ligules of the ray-flowers nearly white. 



Leaves 1-3-pinnately dissected, the divisions incised or lobed ; ray -flowers with inconspicuous, en- 

 tire ligules. 

 Leaves 1-pinnateor undivided, the segments rei 



showy and lobed ligules. 



henes flattened, broadest above the middle: li 

 Rays inconspicuous and caducous or wanting. 

 Leaves usually undivided : pappus awns 3 o 

 Disk-corollas pale, 4-lobed : achene-mare 



tire ligules. 1. B. bipinnata. 



Leaves 1- pinnate or undivided, the segments regularly serrate : ray-flowers with 



showy and lobed ligules. 2. B. leucantha. 



Achenes flattened, broadest above the middle: ligules of the ray-flowers yellow. 



is or wanting, 

 ippus awns 3 or 4. 



pale, 4-lobed : achene-margins strongly, retrorsely barbed 



throughout ; involucre long. 3. B. comosa. 



Disk-corollas orange, 5-lobed : barbs of the achene-margins few, directed 



both ways : involucre short. 4. B. connata. 



Leaves 3-5-divided : pappus-awns 2. 



Awns long, usually retrorsely barbed : achenes 6-8 mm. long. 



Outer involucral bracts 10-16, ciliate, the inner constricted at the tip : 



corollas pale. 5. B. vulgata. 



Outer bracts 6-8, nearly glabrous, the inner not constricted : corollas 



orange. 6. B.frondosa. 



Awns short, erect-barbed : achenes 4.5 mm. long : leaf-blades long-acumi- 

 nate. 7. B. discoidea. 



1 Contributed by Dr. Karl M. Wiegand. 



