Sonchus arvensis from Canada-GS18062021-1

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Gurcharan Singh

Jun 18, 2021, 5:28:42 AM6/18/21
to efloraofindia
Sonchus arvensis var. arvensis
Sonchus arvensis as understood now does not occur India or China, is a perennial species which unlike S. brachyotus (peduncles and phyllaries glabrous  at the most few hairs at base) and S. wightianus (florets reddish outside, peduncles and phyllaries glandular hairy in subsp. wightianus, white tomentose in Subsp. wallichianus) has glandular hairy peduncles and involucre bracts (stalked glands in var. arvensis, few sessile glands in var. uliginosus). 
 They are however, genetically very distinct, S. arvensis var. arvensis is a hexaploid, var. uliginosus a tetraploid and, S. brachyotus S. wightianus being involved parents along with S. maritimus. The taxonomy is very complex.
   Here is S. arvensis var. arvensis clicked from Kaneff Crescent, Mississauga, Canada, 31-7-2019 

Dr. Gurcharan Singh
Retired  Associate Professor
SGTB Khalsa College, University of Delhi, Delhi-110007
Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018.
Sonchus arvensis--3620 Kaneff Crescent Mississauga-IMG_1788-Canada-2.jpg
Sonchus arvensis--3620 Kaneff Crescent Mississauga-IMG_1797-Canada-3.jpg
Sonchus arvensis--3620 Kaneff Crescent Mississauga-IMG_1798-Canada-4.jpg
Sonchus arvensis--3620 Kaneff Crescent Mississauga-IMG_1793-Canada-1.jpg
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