Botanical Survey of India | Flora of India

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Herbs, perennial, white tomentose, subdioecious, rhizomatous; rhizome often creeping; scapes with few to numerous scale leaves. Leaves all basal, sagittate to reniform, dentate or deeply lobed or toothed, long petioled. Inflorescence corymbose or racemosely paniculate. Capitula purple white or greenish yellow, radiate or discoid, narrowly campanulate, 1-many, terminating the scapes. Involucre campanulate; bracts in 1 - 2 rows, equal. Receptacle flat, epaleaceous. Male cupituta with numerous tubular, hermaphrodite florets; carolla limb of tubular florets elongate, 5-lobed, usually with a marginal ling of 1 - 10 sterite, filiform, truncate or minutely radiate, female florets. Anther base entire or subauricled. Female capitula with numerous fertile, minutely radiate, filiform florets. Styles long, undivided, apex obtuse. Achenes cylindric, glabrous, 5 - 10-ribbed. Pappus hairs white, minutely barbell ate, copious in female florets, few in male florets.

Distributed in Nepal. Tibet, China, Vietnam, Taiwan, Europe and Indonesia; 3 in India.

Literature. OMAN, J. (1972). A Taxonomic survey of the genera Petasites and Endocellion. Folia Geobot. Phyt. 7: 381-406.



KEY TO THE SPECIES


1a. Capitula homogamous 1. Petasites albus
b. Capitula heterogamous 2
2a. Female florets surrounding only one disc floret 2. Petasites kamengicus
b. Female florets surrounding more than one disc florets 3. Petasites tricholobus


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