Flora of North America species comparison

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Bacopa repens

Bacopa rotundifolia

creeping water-hyssop

disc waterhyssop, disk water-hyssop, round-leaf water-hyssop, wet waterhyssop
Habit Annuals or perennials. Annuals [perennials].
Stems

erect, 15–40 cm, hairy, glabrescent.

prostrate, 15–60 cm, hairy, sometimes sparsely so, glabrescent.
Leaves

hairy, glabrescent;

blade base narrowly cuneate, margins entire, apex rounded.

hairy;

blade base broadly cuneate, margins entire, apex ± rounded.
Pedicels

1.5–15 mm.

9–15 mm.
Flowers

sepals 4(or 5), oblong to lanceolate, calyx bilaterally symmetric;

corolla pink with pink throat or white with white throat, 2–5 mm;

stamens 4, didynamous.

sepals 5, ovate to oblong, calyx bilaterally symmetric;

corolla white with yellow throat, 5–10 mm;

stamens 2–4, equal.
2n

= 28.

= 56.

Bacopa repens

Bacopa rotundifolia
Phenology Flowering Jul–Sep. Flowering May–Nov.
Habitat Muddy sites, pools, rice fields. In water or on mud in lakes, ponds, pools, in and around marshes and ditches, ephemeral pools on rock outcrops.
Elevation 0–100 m. (0–300 ft.) 0–2300 m. (0–7500 ft.)
Distribution
from FNA
CA; FL; LA; SC; TX; Central America; West Indies (Greater Antilles, Lesser Antilles, Puerto Rico) [Introduced in North America; introduced also in Mexico, South America (Colombia), Asia (China)]
[BONAP county map]
from FNA
AL; AR; AZ; CA; CO; IA; ID; IL; IN; KS; KY; LA; MD; MN; MO; MS; MT; NC; ND; NE; NM; OK; SD; TN; TX; VA; WI; WY; AB; SK [Introduced in Europe (Greece, Spain)]
[WildflowerSearch map]
[BONAP county map]
Discussion

Bacopa rotundifolia is the most widespread member of the genus in the United States; it is invasive in rice fields.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 17, p. 263. FNA vol. 17, p. 261.
Parent taxa Plantaginaceae > Bacopa Plantaginaceae > Bacopa
Sibling taxa
B. caroliniana, B. egensis, B. eisenii, B. innominata, B. monnieri, B. rotundifolia
B. caroliniana, B. egensis, B. eisenii, B. innominata, B. monnieri, B. repens
Synonyms Gratiola repens, Macuillamia repens Monniera rotundifolia, B. nobsiana, B. simulans, Bramia rotundifolia, Macuillamia rotundifolia
Name authority (Swartz) Wettstein: in H. G. A. Engler and K. Prantl, Nat. Pflanzenfam. 67[IV,3b]: 76. (1891) (Michaux) Wettstein: in H. G. A. Engler and K. Prantl, Nat. Pflanzenfam. 67[IV,3b]: 76. (1891)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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