Sulphur Cosmos is considered an annual herb, although plants may
re-appear via self-sowing for several years. Plants are 1-7 ft tall, hairless
or sparsely hairy to bristly. Flower-heads are carried on stalks about
10-20 cm long. Ray flowers are intensely yellow to red-orange, blade
obovate, 1.8-3 cm, tips flat, finely toothed. Disk flowers are 6-7 mm.
Calycular bracts are spreading-rising up, linear-sharp-tipped, 5-7 mm;
involucre 6-10 mm in diameter; phyllaries erect, oblong-lanceshaped,
9-13 mm, tips pointed to rounded-blunt.
Leaves are stalked; stalks 1-7 cm; blade 5-12 cm, ultimate lobes 2-5 mm
wide, margin sparsely spinulose-fringed with hairs, tip apiculate.
It is especially popular in Korea and Japan, where it is often
seen in mass plantings along roadsides, following an initiative pursued
by the Korean-Japanese botanist Woo Jang-choon.
Sulphur Cosmos is native to Mexico.
Identification credit: Rita Singh
Photographed in Delhi and Manipur.
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The flower labeled Sulphur Cosmos is ...