When does stinging serpent bloom in Texas?

Most often in July. Across 115 dated, research-grade observations of Cevallia sinuata in Texas, the flowering season runs roughly May to November.

Peak July In flower 115 Examined 147 State Texas

Flowering 115 in flower of 147 examined

69%

66%

92%

79%

100%

73%

78%

81%

75%

Proportion of examined Cevallia sinuata in Texas in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	1	2	too few examined
Feb	1	1	too few examined
Mar	9	13	69%	42% to 87%
Apr	19	29	66%	47% to 80%
May	12	13	92%	67% to 99%
Jun	11	14	79%	52% to 92%
Jul	7	7	100%	65% to 100%
Aug	10	10	100%	72% to 100%
Sep	8	11	73%	43% to 90%
Oct	18	23	78%	58% to 90%
Nov	13	16	81%	57% to 93%
Dec	6	8	75%	41% to 93%

Peak flowering in Jul. Each bar is the share of Cevallia sinuata in Texas 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. 115 of 147 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 2 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.wt38fd.

What this is, and what it is not

This is a record of when people in Texas found Cevallia sinuata in flower, not a forecast. It is computed only from observations made in Texas, so it is not the species’ global average dragged onto a map: the same plant flowers on different dates in different places, and that is the entire point of the page.

It will not tell you what your particular plant will do this year. Bloom time moves with the season, with altitude, and with the weather, and a warm February pulls everything forward. We publish the distribution and the sample size, and we refuse to draw a month that too few people examined.

The plant

Cevallia sinuata

stinging serpent

Sourcesevery claim on this page

GBIF (iNaturalist Research-grade Observations). Dated flowering annotations in Texas. Every record achieved iNaturalist quality grade Research, which is applied upstream at export. 10.15468/dl.wt38fd. Retrieved 2026-07-14.
World Flora Online Plant List. The accepted name. CC0. Retrieved 2026-07-12.