Botanical Survey of India | Flora of India

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Ixeris Cass.


Herbs, annual or biennial with white latex; roots simple; stems usually flaccid, erect, glabrous, solitary or branched from the base. Leaves chiefly all radical, rarely cauline, variable, linear or linear-lanceolate, sagittate, acute or obtuse, entire or sinuate-toothed, petioled or sessile. Inflorescence usually subumbellate corymbs. Heads erect, cylindric; peduncle slender, erect, bracteate. Involucral bracts in 3 - 3 series, equal or unequal; outer very minute, ovate or obovate; inner linear-oblanceolate. Florets allligulate; ligules 5-toothed; corolla usually yellow. Stamens 5, appendaged; anthers pinkish or yellow, slender, base sagittate. Style slender; stigma bifid. Achenes pale brown or dark brown, usually elliptic-lanceolate or somewhat rounded and angular. Pappus white, simple.

Literature. STEBBINS. G.L. (1939) Critical notes on the genus Ixeris. J. Bot. 75: 34-51.

An Asiatic genus distributed from Himalayan region to Japan; ca 50 species, 3 in India.



KEY TO THE SPECIES


1a. Leaves all radical; sagittate, acute or obtuse, entire or denticulate; achenes dark brown 3. Ixeris sagittarioides
b. Leaves radical as well as cauline, linear or linear-lanceolate, sinuate toothed; achenes pale brown 2
2a. Radical leaves broadly linear-lanceolate, entire, sinuate-toothed or pinnatifid; cauline leaves with acute auricles at base. 2. Ixeris polycephala
b. Radical leaves narrowly linear-lanceolate, entire; cauline leaves not auricled 1. Ixeris gracilis


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