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Benghal dayflower, dayflower, jio, tropical spiderwort

Habit Herbs, annual.

thin, rhizomes short, subterranean, bearing cleistogamous flowers produced from base of plant.


ascending to decumbent or occasionally scrambling.


leaf sheaths, not auriculate, often with red hairs at summit;

blade ovate to lanceolate-elliptic, (1–)2–9(–11) × 1–3(–4.5) cm, apex rounded, obtuse or acute, pubescent.


distal cyme often exserted and 1-flowered, sometimes vestigial;

spathes often clustered, subsessile (peduncles 1–3.5 mm), funnelform, 0.5–1.5(–2) cm, margins connate basally, pubescent.


chasmogamous flowers bisexual and staminate, subterranean cleistogamous flowers bisexual;

petals of staminate flowers all blue (rarely lilac), proximal smaller;

lateral stamen filaments not winged;

staminodes 2–3;

antherodes yellow, cruciform;

pollen white;

medial stamen pollen yellow.


3-locular, 2-valved, 4–6 mm.


5, brown or blackish, seeds of adaxial locule 1.7–2.5 mm, shallowly reticulate, farinose.


= 22.

Commelina benghalensis

Phenology Flowering spring–fall.
Habitat Citrus plantations, fields, yards, and other cultivated and disturbed sites
from FNA
CA; FL; GA; LA; neotropics; native; paleotropics [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]

Commelina benghalensis was first recognized and collected in California in 1980. The California plants are approximately hexaploid and represent a separate and much later introduction than the southeastern plants. The species is federally listed as an Obnoxious Weed.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 22.
Parent taxa Commelinaceae > Commelina
Sibling taxa
C. caroliniana, C. communis, C. dianthifolia, C. diffusa, C. erecta, C. forskaolii, C. gambiae, C. virginica
Name authority Linnaeus: Sp. Pl. 1: 41. (1753)
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