All Floras      Advanced Search
Flora of Taiwan Login | eFloras Home | Help
Flora of Taiwan | Family List | Compositae

Sonchus L.


Sonchus arvensis

Credit: HAST

Annual, biennial or perennial herbs, sometimes woody at base. Leaves alternate, usually auriculate-clasping, often with callose hairs or spinose on margins, entire or dentate or pinnatifid. Heads homogamous, many flowered, becoming swollen at base. Involucre ovoid or campanulate; bracts imbricate, in several series, herbaceous or membranaceous. Receptacle flat, glabrous. Corolla ligulate, yellow, truncate, 5-lobed. Anthers sagittate at base. Style branches slender. Achenes slightly flattened, 10-20-ribbed, slightly narrowed at both ends, beakless, oval to linear, glabrous. Pappus bristles copious, in many series, slender, snow white, connate at base into a ring, usually deciduous as a whole.

About 45 species, natives of the Old World, a few species widely distributed and naturalized; three species in Taiwan.


1 Perennials with deep, creeping roots; heads 3-5 cm across in flower, fruiting involucre 14-22 mm long.   Sonchus arvensis
+ Annuals from a tap root; heads 1.5-2.5 cm across in flower, fruiting involucre 9-13 mm long.   (2)
2 (1) Leaf base auriculate, acute; mature achenes not transversely rugulose.   Sonchus asper
+ Leaf base auriculate, rounded; mature achenes transversely rugulose.   Sonchus oleraceus

Lower Taxa

Related Synonym(s):


Related Objects  

Flora of Chile  
  • PDF
  • PDF

     |  eFlora Home |  People Search  |  Help  |  ActKey  |  Hu Cards  |  Glossary  |