Family: Asteraceae
Picnomon
Citation:
Adans., Faro. 2:116, 590 (1763).
Derivation: Greek pikros, sharp; nomos, pasture; describing a spiny plant growing in pasture.
Synonymy: Not Applicable Common name: Thistles.
Description:
Spiny annual and biennial herbs; vestiture cobwebby; stems erect with spiny wings; leaves alternate, basal and cauline, dentate to pinnatisect.
Capitula subsessile, solitary or in clusters, homogamous; involucres cylindrical, exceeded by the surrounding leaves; bracts rigid, herbaceous, each with a recurved pinnate spiny apical appendage, imbricate in many unequal series; receptacle with bristle-like scales; florets all tubular, bisexual, fertile; corolla narrow, slightly widened upwards, 5-lobed, purple; anthers tailed at the base with subulate sterile appendages at the apex; style branches diverging at the apex only, without appendages.
Achenes oblong to obovate, compressed, glabrous; pappus of numerous plumose bristles connate in a ring at the base and deciduous as a unit.
Biology:
No text
Taxonomic notes:
Monotypic.
Author:
Not yet available
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