Flora of North America species comparison

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Bacopa caroliniana

Bacopa rotundifolia

blue water-hyssop, lemon bacopa

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

prostrate, 15–30 cm, hairy.

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

hairy;

blade base broadly cuneate, margins entire, apex obtuse.

hairy;

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

5–15 mm;

bracteoles present.

9–15 mm.
Flowers

sepals 5, ovate, calyx bilaterally symmetric;

corolla violet-blue with violet-blue throat, 10–13 mm, lobes 4;

stamens 2–4, didynamous.

sepals 5, ovate to oblong, calyx bilaterally symmetric;

corolla white with yellow throat, 5–10 mm;

stamens 2–4, equal.
2n

= 56.

Bacopa caroliniana

Bacopa rotundifolia
Phenology Flowering Jun–Nov. Flowering May–Nov.
Habitat Marshes, swamps, margins of streams, pastures. In water or on mud in lakes, ponds, pools, in and around marshes and ditches, ephemeral pools on rock outcrops.
Elevation 0–300 m. (0–1000 ft.) 0–2300 m. (0–7500 ft.)
Distribution
from FNA
AL; FL; GA; LA; MD; MS; NC; SC; TX; VA
[WildflowerSearch map]
[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 caroliniana is used in aquascaping in freshwater aquariums. The species can be propagated vegetatively through cuttings. The leaves of B. caroliniana are lemon scented when crushed.

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

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. 261. FNA vol. 17, p. 261.
Parent taxa Plantaginaceae > Bacopa Plantaginaceae > Bacopa
Sibling taxa
B. egensis, B. eisenii, B. innominata, B. monnieri, B. repens, B. rotundifolia
B. caroliniana, B. egensis, B. eisenii, B. innominata, B. monnieri, B. repens
Synonyms Obolaria caroliniana, Hydrotrida caroliniana Monniera rotundifolia, B. nobsiana, B. simulans, Bramia rotundifolia, Macuillamia rotundifolia
Name authority (Walter) B. L. Robinson: Rhodora 10: 66. (1908) (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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