Crepidiastrum sonchifolium

Plate 1 figs. a–h · 8 separate observations

Every figure is a research-grade observation under CC0, CC BY or CC BY-SA, rehosted with the photographer’s name, the licence and the observation it came from. Photographs under a NonCommercial licence are excluded from this site and are never stored, which costs us a great many pictures and is not negotiable.

Native range 9 botanical countries

Native distribution of Crepidiastrum sonchifolium, after Kew’s World Checklist of Vascular Plants. Introduced, extinct and doubtful records are excluded, so this is where the plant is from, not everywhere it now grows. Regions too small to draw at this scale are marked with a dot.

Region	TDWG code	Continent
China North-Central	CHN	ASIA-TEMPERATE
China South-Central	CHC
China Southeast	CHS
Inner Mongolia	CHI
Korea	KOR
Manchuria	CHM
Mongolia	MON
Thailand	THA	ASIA-TROPICAL
Vietnam	VIE

Region boundaries approximated from Natural Earth (public domain) and mapped to TDWG World Geographical Scheme for Recording Plant Distributions (WGSRPD) level-3 botanical countries (Brummitt 2001). Indicative, not the official WGSRPD geometry.

Flowering 166 in flower of 217 examined

72%

93%

88%

86%

91%

80%

67%

73%

Proportion of examined Crepidiastrum sonchifolium in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	1	too few examined
Feb	0	0	too few examined
Mar	1	14	7%	1% to 31%
Apr	39	54	72%	59% to 82%
May	64	69	93%	84% to 97%
Jun	22	25	88%	70% to 96%
Jul	6	7	86%	49% to 97%
Aug	10	11	91%	62% to 98%
Sep	4	5	80%	38% to 96%
Oct	8	12	67%	39% to 86%
Nov	11	15	73%	48% to 89%
Dec	1	4	too few examined

Peak flowering in May. Each bar is the share of Crepidiastrum sonchifolium observations in which someone actually recorded the reproductive state and found the plant in flower, not the raw number of flowering records. That distinction matters: people observe plants far more in spring than in winter, so a bare count of flowering records partly measures when people go outside. Dividing by the number examined removes that. 166 of 217 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 3 months have fewer than 5 examined observations, so no proportion is drawn for them. This is still a global aggregate and not a forecast for your garden: the same species flowers on different dates in different hemispheres. Where a species has fewer than 30 flowering records we do not draw this chart at all. Computed from 10.15468/dl.cgje2x.

Where it actually grows measured, from 518 observations

Condition	5th percentile	Median	95th percentile
Coldest month, mean daily low	-13.1 °C	-9.1 °C	-2.3 °C
Warmest month, mean daily high	26.7 °C	30.4 °C	31.9 °C
Annual rainfall	514 mm	652 mm	1,509 mm
Rainfall in the driest quarter	10 mm	14 mm	93 mm

It is found where winters bring hard frost. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 518 research-grade observations of Crepidiastrum sonchifolium that carry a coordinate, and this is the range those places actually span. The 5th and 95th percentiles are used rather than the minimum and maximum, because a single cultivated specimen in a heated conservatory should not widen a tropical plant's range to the Arctic.

This is not a hardiness zone. A USDA zone is the average annual extreme minimum temperature. The figure above is the mean daily minimum of the coldest month, which is a different quantity and is typically far warmer. Reading one as the other would place a plant several zones too warm, so we do not publish a hardiness zone, because we do not have one. Climate from CHELSA V2.1 (Karger et al. 2017); occurrences from 10.15468/dl.cgje2x.

Also published as 26 synonyms

A synonym is not an error. It is a record of botanists disagreeing, in print, about where this plant belongs. Each of these was somebody’s considered answer.

Crepidiastrum sonchifolium var. elegans (Franch.) Sennikov
Crepidiastrum sonchifolium var. sonchifolium
Ixeridium elegans (Franch.) C.Shih
Ixeridium sonchifolium (Maxim.) C.Shih
Ixeris denticulata subsp. elegans (Franch.) Stebbins
Ixeris denticulata subsp. pubescens Stebbins
Ixeris denticulata subsp. sonchifolia (Bunge) Stebbins
Ixeris riparia (Kerr) Stebbins
Ixeris serotina (Maxim.) Kitag.
Ixeris sonchifolia (Maxim.) Nakai
Ixeris sonchifolia (Maxim.) C.Y.Li
Ixeris sonchifolia (Maxim.) Hance
Ixeris sonchifolia var. serotina (Maxim.) Kitag.
Ixeris sonchifolia var. sonchifolia
Lactuca bungeana Nakai
Lactuca denticulata var. sonchifolia (Bunge) Maxim.
Lactuca elegans Franch.
Lactuca riparia Kerr
Lactuca sonchifolia (Maxim.) Benth. & Hook.f. ex Debeaux
Paraixeris serotina (Maxim.) Tzvelev
Paraixeris sonchifolia (Maxim.) Tzvelev
Paraixeris sonchifolia var. serotina (Maxim.) Kitag.
Paraixeris sonchifolia var. sonchifolia
Prenanthes sonchifolia Bunge

and 2 more.

Sourcesevery claim on this page

World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
Kew, World Checklist of Vascular Plants (WCVP v16). native distribution by TDWG level-3 botanical country, and life form. CC BY 3.0. Retrieved 2026-06-04.

We publish what we can source and we say so when we cannot. This page has no care advice and no toxicity claim, because we do not yet have those from a source we can cite.