Field Sowthistle
Sonchus arvensis uliginosus
Description 4
This adventive perennial plant is 2–3½' tall, branching occasionally in the upper half. The dull green stems are hairless. The alternate leaves are up to 12" long and 3½" across, becoming smaller as they ascend the stems. Most of these leaves are located in the lower half of the plant. They are lanceolate, oblanceolate, or ovate in overall shape, but usually have about 2-5 lobes with pointed tips on each side (pinnatifid). Some of the upper leaves may be unlobed, and occasionally there are plants without significant lobes on the leaves. The margins are dentate-prickly. The upper surface of each leaf is glabrous, while the lower mid-rib is without prickles. At the base of each leaf, there is a pair of small basal lobes that clasp the stem. These basal lobes are usually rather small and well-rounded.
Sources and Credits
- (c) Jason Whittle, some rights reserved (CC BY-NC-ND), uploaded by Jason Whittle
- (c) anonymous, some rights reserved (CC BY-NC), http://www.illinoiswildflowers.info/weeds/photos/per_sowthistle1.jpg
- (c) anonymous, some rights reserved (CC BY-NC), http://www.illinoiswildflowers.info/weeds/photos/per_sowthistle2.jpg
- (c) John Hilty, some rights reserved (CC BY-NC), http://eol.org/data_objects/29447618
More Info
- iNat taxon page
- Biodiversity Heritage Library
- BOLD Systems BIN search
- Calflora
- CalPhotos
- eFloras.org
- Flora of North America (beta)
- Global Biodiversity Information Facility (GBIF)
- Go Botany
- HOSTS - a Database of the World's Lepidopteran Hostplants
- IPNI (with links to POWO, WFO, and BHL)
- Jepson eFlora
- Maryland Biodiversity Project
- NatureServe Explorer 2.0
- NBN Atlas
- SEINet Symbiota portals
- Tropicos
- USDA PLANTS database
- VASCAN by Canadensys
- World Flora Online
