Botanical Survey of India | Flora of India

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Youngia Cass.


Herbs, annual or perennial with white latex; roots simple or rootstock stout; stem erect, stout or sometimes dwarf, glabrous or puberulous, solitary or branched; branches corymbosely spreading. Leaves chiefly radical, rarely alternate, rosulate, oblanceolate, obovate, spathulate, sinuate-toothed, often variously lobed; cauline leaves usually few, linear or linear-lanceolate. Inflorescence corymbosely panicled or terminal. Heads cylindric, erect; peduncle slender. Involucral bracts usually 2 - 3 seriate; outer ovate or obovate inner linear-lanceolate or oblong-lanceolate. Ligules yellow, 5-toothed. Stamens 5, appendaged; anthers slender, base sagittate. Stigma bifid; branches slender. Achenes brown, reddish brown, compressed or angular, narrowed into a stout beak, irregularly ribbed. Pappus white or silvery or dirty white, soft, simple.

Himalayan region eastwards to Japan from tropical, subtropical, temperate to alpine regions; ca 35 species, 13 in India.

Literature. BABCOCK, E.B. & G.L. Jr. STEBBINS (1937). The genus Youngia Carn. Inst. Wash. Publ. no. 484. 106.



KEY TO THE SPECIES


1a. Annual or perennial herbs; flowering branches long, usually many from the root or rootstock; heads few numerous 2
b. Perennial herbs; stems or flowering branches very short, stout, few from the rootstock; head, few, often solitary 9
2a. Annuals; densely corymbosely branched above 3
b. Perennials; broadly or loosely corymbosely branched above 6
3a. Pappus greyish 3. Youngia fuscipappa
b. Pappus white or yellowish 4
4a. Achenes longer than the pappus 4. Youngia glauca
b. Achenes equal to or shorter than the pappus 5
5a. Heads numerous, 4 - 6 mm long; peduncle bracteolate 7. Youngia japonica
b. Heads few, 8 mm long; peduncles ebracteolate 12. Youngia stebbinsiana
6a. Stems quite glabrous, grooved; leaves usually divided into many unequal lobes or segments; involucre glabrous or sparsely pubescent 13. Youngia tenuifolia
b. Stems glabrous or sparsely pubescent, not grooved; leave. thick, obovate or obovate-spathulate, with no segments; involucre densely tomentose 7
7a. Radical leaves not tapering; petiole usually simple, short, without wings, base simple 6. Youngia hondae
b. Radical leaves tapering to a long, simple or winged petiole 8
8a. Achenes 5 - 6 mm long, pappus 2 - 3 seriate 8. Youngia nilgiriensis
b. Achenes 4 - 4.5 mm long; pappus uniseriate 1. Youngia cineripappa
9a. Heads broad, campanulate 10
b. Heads cylindric 11
10a. Achenes columnar, subterete or 4-angled; pappus 10 - 11 mm long 11. Youngia simulatrix
b. Achenes compressed; narrowed at both ends, not angled; pappus 7 - 8.5 mm long. 5. Youngia gracilipes
11a. Flowering stems absent or very short; heads few; achenes 5 - 6 mm long with a pale beak 2. Youngia depressa
b. Flowering stems present, stout; heads few to many; achenes 3 - 4 mm long without a pale beak 12
12a. Plants quite glabrous; radical leaves narrowed into a short petiole, quite entire or obscruely toothed 10. Youngia silhetensis
b. Plants glabrous or puberulous; radical leaves narrowed into a long, winged petiole, usually sinuate toothed 9. Youngia recemifera


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