Drosera roraimae, Gran Sabana, 8011, Bolívar, Venezuela

Drosera roraimae (Klotzsch ex Diels) Maguire & Laundon

Droseraceae

Climate known 64 photographs Carnivorous plant

Every figure on this page is derived from public data by a stated rule and says its source; nothing here is written by a person or a model, except the Wikipedia passage, which is quoted and marked as such. How it is made.

Summary

Drosera roraimae is a sundew native to Brazil, Guyana, and Venezuela. It was originally described as a variety of Drosera montana before being raised to species rank in 1957.

Text from Wikipedia, “Drosera roraimae”, CC BY-SA 4.0, quoted as written. Kept separate from everything derived here.

About the genus · Drosera

Drosera, which is commonly known as the sundews, is one of the largest genera of carnivorous plants, with at least 194 species. These members of the family Droseraceae lure, capture, and digest insects using stalked mucilaginous glands covering their leaf surfaces. The insects are used to supplement the poor mineral nutrition of the soil in which the plants grow. More on Wikipedia ›

The opening of Wikipedia, “Drosera”, CC BY-SA 4.0, quoted as written.

Family

Droseraceae

Described by

(Klotzsch ex Diels) Maguire & Laundon

Native to

Guyana, Venezuela, Brazil North

Wild records

170 in range· 132 open

At a glance

Warmest month

25°C

Oct, mean day; nights 16 °C (CHELSA)

Rain

3279mm/yr

12 wet months · peak Jun 461 mm (CHELSA)

Light

26–35DLI

mol/m²/day, winter to summer, open sky (CHELSA shortwave)

In short condensed by rule from the cultivation cards · not written by a person

Grouped as a carnivorous plant by the genus Drosera, which is reliably one kind of plant (archetype table). Rain rule: a sharp rainy season, April to October at the habitat (not shifted); the temperature curve is flat (1.1 °C of range), so no growing season is inferred. Habitat rain 3279 mm a year, wettest June at 461 mm, driest February at 136 mm (habitat calendar, northern hemisphere). Open sky over the habitat: 26 to 35 mol/m²/day. Cold floor 13.3 °C (1st-percentile habitat night, NASA POWER).

Each sentence is one card's own one-line form, written by the same rule as the card (Its year, Rain, Light, Temperature); the note cannot say what a card does not. Months are given for the northern hemisphere (set your site in Settings to change this), and the habitat's own alongside. The cards · the figures.

Also known as Drosera montana subsp. robusta Diels; Drosera montana subsp. roraimae Klotzsch; Drosera montana subsp. roraimae Klotzsch ex Diels; Drosera montana var. robusta Diels; Drosera montana var. roraimae Klotzsch and 1 more.

Cultivation

Grouped as a carnivorous plant by the genus Drosera, which is reliably one kind of plant (archetype table). The table holds no figure for this group, which spans too much for one minimum; the cold floor is the habitat's alone, and no prose comes from the table.

Its year Rain rule: a sharp rainy season, April to October at the habitat (not shifted); the temperature curve is flat (1.1 °C of range), so no growing season is inferred.

This species’ habitat figures, and what two fixed rules read from them.

The rain rule reads a sharp season: 70% of the year's rain (2451 mm of 3279 mm) falls in April to October. The temperature curve is flat, 1.1 °C between the warmest and coldest month, so the growing-season rule does not infer a growing season from it. Months are the habitat's, northern hemisphere, within 10° of the equator; with no thermal season there there is no season to reverse, so they are not shifted for a collection elsewhere.

Read from the median year of CHELSA monthly rainfall and mean temperature across the envelope cells: the rain rule takes the smallest set of months carrying 70% of the rain and calls it winter when its mean is more than half a degree below the year's, summer when more than that above, and neither in between; the temperature rule, used only under 120 mm, names the cooler six months when they are at least a degree cooler than the other six. Months are shifted for the other hemisphere only where the temperature curve gives a season to reverse. A reading of the curves, not an observation of the plant.

Rain Habitat rain 3279 mm a year, wettest June at 461 mm, driest February at 136 mm (habitat calendar, northern hemisphere).

This species’ habitat figures, with their source.

3279 mm a year at the habitat, 2451 mm of it April to October. Wettest month June at 461 mm, driest February at 136 mm. Across the envelope cells the year's total runs 2183 mm to 5054 mm (10th to 90th percentile of each cell's own year) (median year across the envelope cells, CHELSA; habitat calendar, northern hemisphere).

CHELSA monthly precipitation, median year across the envelope cells. The rain that falls where the species is recorded; nothing about how the plant takes water.

Light Open sky over the habitat: 26 to 35 mol/m²/day.

This species’ habitat figures, with their source.

Open sky over the habitat: 26 to 35 mol/m²/day across the year (daily light integral, median year across the envelope cells, CHELSA; the lowest 10th-percentile month across the cells is 21, the highest 90th-percentile month 38).

CHELSA shortwave radiation at each envelope cell, a daily-mean flux taken to a daily total and converted at 2.07 mol of PAR per MJ. The sky over the habitat, measured; what reaches a plant under a rock, a shrub or a shade cloth is not.

Warmth and air Cold floor 13.3 °C (1st-percentile habitat night, NASA POWER).

This species’ habitat figures, with their source.

Temperature

Coldest: the 1st-percentile night over 44 years at the typical cell is 13.3 °C, the absolute minimum 10.9 °C, no frost in 44 years (NASA POWER daily minima). Warmest: the 99th-percentile day is 30.9 °C. Monthly means: coldest night 15.7 °C in January (across the envelope cells 10.7 °C to 20.7 °C), warmest day 24.8 °C in October (median year across the envelope cells, CHELSA). Cold floor: 13.3 °C, which is the 1st-percentile night over 44 years at the typical cell (NASA POWER).

NASA POWER daily minima and maxima 1981–2024 at the typical cell, lapse-corrected to its elevation; CHELSA monthly means, median year across the envelope cells, CHELSA. The cold floor is the figure named in its sentence. Not a measured survival limit for any plant in a pot.

Humidity

Relative humidity at the habitat: 67 to 74% across the year (monthly means, median year across the envelope cells, CHELSA). A figure about the air, saying nothing about how the plant takes water.

CHELSA relative humidity, median year across the envelope cells.

The figures the cards read from are in Climate below, and where they came from in Natural habitat.

Climate across the habitat

day night rain 10th–90th percentile across 117 habitat cells cold quarter: the three months around the coldest night extremes over 44 years at the typical cell, marked at the edge: undated DLI, mol/m²/dayRH %each on its own scale

Figures by month

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Day °C	24 / 19–29	24 / 20–29	25 / 20–29	24 / 20–29	24 / 19–28	23 / 19–27	23 / 19–27	24 / 19–28	25 / 20–29	25 / 20–29	24 / 20–29	24 / 19–29
Night °C	16 / 11–21	16 / 11–21	16 / 11–21	17 / 12–22	17 / 12–22	17 / 12–21	16 / 11–21	16 / 11–21	16 / 11–21	16 / 12–21	17 / 12–21	16 / 11–21
Rain mm	152 / 63–245	136 / 58–235	150 / 65–279	255 / 148–418	406 / 289–593	461 / 322–709	444 / 291–734	361 / 223–630	280 / 133–450	244 / 133–392	210 / 129–358	180 / 103–299
DLI	31 / 27–34	33 / 28–35	34 / 28–37	30 / 23–34	26 / 21–30	26 / 22–29	29 / 25–31	32 / 29–35	35 / 31–38	34 / 30–37	30 / 27–34	29 / 26–32
RH %	69 / 62–72	67 / 62–71	67 / 61–71	70 / 63–72	73 / 68–75	74 / 70–76	73 / 69–75	71 / 67–73	69 / 64–71	68 / 63–71	70 / 64–72	71 / 65–74

Each figure is the median across the 117 grid cells holding the 161 in-range records, with the 10th–90th percentile span across those cells after the slash where it differs. Extremes and elevation were read at the typical cell 1693:2379 (5.325, -61.025). Over 44 years there: absolute minimum 10.9 °C, 1st-percentile night 13.3 °C, 99th-percentile day 30.9 °C. Normals: CHELSA V2.1 1981–2010 climatology, 0.05° cells (each the mean of ~36 1 km pixels). Envelope: median and 10th–90th percentile of each month across the 117 distinct grid cells holding the 161 in-range records; extremes and elevation at the typical cell 1693:2379 (its coldest month's mean night nearest the median across cells); its position is the cell centre. Extremes: NASA POWER (MERRA-2) daily 1981–2024, cell 5.50_-61.250, lapse-corrected +110 m at 6.5 °C/km. Elevation: ETOPO 2022, 1208 m (cell mean).

Natural habitat

Native range as published by WCVP; the marker is where the records are densest and decides nothing: the climate was read across every in-range record's cell, not at the marker.

Openly licensed records inside the range, framed on where they fall.

NativeGuyana, Venezuela, Brazil North

Kew's description“perennial or subshrub” · “wet tropical”· quoted from WCVP, RBG Kew (CC BY 4.0); not derived here

Map marker5.168, -60.779 · in the densest population, 98 records (58% of those in range)

Evidence usedThe map marker and the climate envelope rest on all 170 georeferenced records inside the native range; the map shows only the 132 openly licensed ones, which alone would put the marker 84 km away. 1 record outside the range (gardens, roadsides, misidentifications) ignored. 9 in-range records are placed to worse than 10 km and stay on the map but off the climate.

The map markerthe map marker: the openly licensed record nearest the middle of the densest 1° population of the 170 in-range records; it decides nothing.

Photographs

Photographs: (c) topeuna, some rights reserved (CC BY) (8).

Photographs: iNaturalist did not answer when this page was built; what is shown came from the sources that did.

Papers naming this species

Works whose title or abstract names Drosera roraimae, most cited first, from OpenAlex (CC0). A mention, not a cultivation source: nothing on this page is drawn from them.

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