Flora of North America species comparison

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Bacopa egensis

Bacopa rotundifolia

Brazilian water-hyssop

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

prostrate, 15–30 cm, hairy.

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

glabrous;

blade base narrowly cuneate, margins crenate, apex rounded with a narrow petiole-like base.

hairy;

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

10–12 mm.

9–15 mm.
Flowers

sepals 4(or 5), ovate to oblong, calyx radially symmetric;

corolla white with yellow throat, 3–5 mm;

stamens 3 or 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 egensis

Bacopa rotundifolia
Phenology Flowering Aug–Oct. Flowering May–Nov.
Habitat Shallow, quiescent water, lakes. In water or on mud in lakes, ponds, pools, in and around marshes and ditches, ephemeral pools on rock outcrops.
Elevation 0–20 m. (0–100 ft.) 0–2300 m. (0–7500 ft.)
Distribution
from FNA
AR; LA; Central America (Costa Rica, Nicaragua); South America (Brazil) [Introduced in North America; introduced also in w, c Africa (Republic of Cameroon, Democratic Republic of Congo, Ghana, Nigeria, Senegal)]
[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 egensis was first collected in the United States by Josiah Hale in the early 1800s (C. E. Depoe 1969). There are subsequent collections from Arkansas and Louisiana.

(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. 262. FNA vol. 17, p. 261.
Parent taxa Plantaginaceae > Bacopa Plantaginaceae > Bacopa
Sibling taxa
B. caroliniana, B. eisenii, B. innominata, B. monnieri, B. repens, B. rotundifolia
B. caroliniana, B. egensis, B. eisenii, B. innominata, B. monnieri, B. repens
Synonyms Hydranthelium egense Monniera rotundifolia, B. nobsiana, B. simulans, Bramia rotundifolia, Macuillamia rotundifolia
Name authority (Poeppig) Pennell: Proc. Acad. Nat. Sci. Philadelphia 98: 96. (1946) (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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