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Coreopsis grandiflora

Dummer. ゛☀
2017-07-30
Family - Asteraceae
Stems - Multiple from base, herbaceous, branching, erect or reclining, with vertical striations, glabrous to villous, fistulose.

Stems - Multiple from base, herbaceous, branching, erect or reclining, with vertical striations, glabrous to villous, fistulose.



Leaves - Opposite, sessile, linear oblong to oblanceolate, often with two or four pinnate lobes, to +10cm long, +2cm broad, acute, entire, scabrous (hairs with swollen bases) or glabrous, with a single prominent midrib. Margins with minute antrorse prickles. The leaves mostly in the basal 1/2 of the plant.
Inflorescence - Single flower head terminating a long naked peduncle. Peduncle to -30cm long.
Involucre. - Involucre of two series (biseriate). Outer phyllaries 8, 5mm long, 2mm broad, with scarious margins, glabrous, green, spreading or slightly erect, expanding in fruit. Inner phyllaries to 1.2cm long, green at base, yellow and translucent at apex, bent at midpoint and the apices spreading, glabrous, acute, to 5mm broad.

Ray flowers - Ligule yellow, +/-2.5cm long, 1.2cm broad, glabrous, 4-lobed near apex. Flowers sterile. Achenes 4mm long in flower, 1mm broad, flattened, greenish. Pappus of two marginal scale-like awns.
Disk flowers - Disk 9mm broad in flower. Flowers yellow, 5-lobed, fertile. Corolla tube to 3mm long, glabrous. Achenes flattened, 1.2mm long in flower, with 2 small awns. Achenes brown, 3mm long, to 1.9mm broad in fruit. Awns deciduous in fruit. Receptacle convex. Chaff to 9mm long, white and flat at the base, filiform and yellow at the apex, well exceeding the disk flowers.

Flowering - April - July.
Habitat - Rocky prairies, glades, bluffs, sandy open ground, roadsides, railroads.
Origin - Native to U.S.
Other info. - This species can be found mainly in the southern half of Missouri. The plant is easy to ID in the field because of its undivided, opposite leaves and big yellow flower heads. This plant does well in cultivation and makes a good garden specimen.
Steyermark breaks the species up into 2 varieties. Variety lanceolata has stems and leaves that are mostly glabrous. Variety villosa Michx. has leaves and stems which are pubescent. Both varieties are equally distributed in the plants habitat.
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