Pectis prostrataCav.

spreading chinchweed

WFO wfo-0000075876 Accepted WFO 2026-06 8 photographs CC BY / CC BY-SA

Plate 1 figs. a–h · 8 separate observations

Pectis prostrata, photographed by Mohammed Kamal-Deen Fuseini
fig. a Mohammed Kamal-Deen Fuseini, CC BY-SA 4.0 / 2022-06-03 / obs. 202958386

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.

The specimen a real sheet, in a real collection

Herbarium
The New York Botanical Garden
Accession
425942
Filed as
Pectis prostrata Cav.
Det. by
D. J. Keil 1984-01-01
Collected
R. McVaugh 1957-08-24
Origin
MX
The sheet
View the digitised specimen (CC BY 4.0)

A real pressed plant, in a real collection, under the accession number above. Not an illustration of one. The holding institution does not serve this sheet’s image to third parties, so there is no photograph here. The record is real and the link goes to it. Where we hold no openly licensed sheet for a species this section is simply absent, and where a sheet never recorded who determined it, that field stays empty rather than being filled in. Roughly half of all herbarium sheets never recorded a determiner, which is ordinary.

Native range 26 botanical countries

Regions where Pectis prostrata is native: Arizona, Florida, Louisiana, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, New Mexico, Texas, Aruba, Bahamas, Belize, Colombia, Costa Rica, Cuba, Ecuador, El Salvador, Guatemala, Honduras, Netherlands Antilles, Nicaragua, Panamá, Puerto Rico, Venezuela ArizonaFloridaLouisianaMexico CentralMexico GulfMexico NortheastMexico NorthwestMexico SoutheastMexico SouthwestNew MexicoTexasBelizeColombiaCosta RicaCubaEcuadorEl SalvadorGuatemalaHondurasNicaraguaPanamáPuerto RicoVenezuela ArubaBahamasNetherlands Antilles
Native distribution of Pectis prostrata, 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.
RegionTDWG codeContinent
Aruba ARU SOUTHERN AMERICA
Bahamas BAH
Belize BLZ
Colombia CLM
Costa Rica COS
Cuba CUB
Ecuador ECU
El Salvador ELS
Guatemala GUA
Honduras HON
Netherlands Antilles NLA
Nicaragua NIC
Panamá PAN
Puerto Rico PUE
Venezuela VEN
Arizona ARI NORTHERN AMERICA
Florida FLA
Louisiana LOU
Mexico Central MXC
Mexico Gulf MXG
Mexico Northeast MXE
Mexico Northwest MXN
Mexico Southeast MXT
Mexico Southwest MXS
New Mexico NWM
Texas TEX

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 133 in flower of 153 examined

Proportion of examined Pectis prostrata in flower, by month
Month In flower Examined Share 95% interval
Jan 0 1 too few examined
Feb 0 0 too few examined
Mar 0 0 too few examined
Apr 1 1 too few examined
May 4 4 too few examined
Jun 1 2 too few examined
Jul 4 11 36% 15% to 65%
Aug 20 20 100% 84% to 100%
Sep 40 44 91% 79% to 96%
Oct 44 49 90% 78% to 96%
Nov 15 15 100% 80% to 100%
Dec 4 6 67% 30% to 90%

Peak flowering in Aug. Each bar is the share of Pectis prostrata 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. 133 of 153 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 6 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 772 observations

Condition 5th percentile Median 95th percentile
Coldest month, mean daily low 0.5 °C 11.4 °C 19.7 °C
Warmest month, mean daily high 28.7 °C 31.3 °C 33.7 °C
Annual rainfall 413 mm 1,340 mm 1,800 mm
Rainfall in the driest quarter 14 mm 181 mm 328 mm

It is found where winters are cool but frost is light or absent. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 772 research-grade observations of Pectis prostrata 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 6 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.

  • Chthonia prostrata Cass.
  • Pectis costata Ser. & Merc. ex DC.
  • Pectis multisetosa Rydb.
  • Pectis prostrata var. prostrata
  • Pectis prostrata var. urceolata Fernald
  • Pectis urceolata (Fernald) Rydb.

Sourcesevery claim on this page

  1. World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
  2. iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
  3. Wikidata. common name (P1843), joined on the World Flora Online identifier (P7715). CC0. Retrieved 2026-07-13.
  4. 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.