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409.0000 Family Hydrostachyaceae Engl.; Bot. Jahrb. Syst. 20: 136 (1894), nom. cons.
1 genus, 20 spp.
Species listed in database: 22
= Hydrostachyeae Tul.; Ann. Sci. Nat., Bot., Sér. 3, 11: 91 (1849)
= Hydrostachyoideae Wedd.; Prodr. [A.P. de Candolle] 17: 43, 86 (1873)
409.0001 Genus Hydrostachys Thouars; Gen. Nov. Madagasc. 2 (1806)
Distribution: Tropical and South Africa, mostly Madagascar
Species listed in database: 22
species :
Hydrostachys angustisecta Engl.; Bot. Jahrb. Syst. 28: 891 (1899)
Distribution: Tanzania
25 TAN
Synonyms: hidden
= Hydrostachys inaequalis Reimann; Notizbl. Bot. Gart. Berlin-Dahlem 12: 83 (1934)
species :
Hydrostachys bismarckii Engl.; Bot. Jahrb. Syst. 20: 137 (1894)
Distribution: D.R.Congo [Zaire]
23 ZAI
species :
Hydrostachys decaryi H.Perrier; Arch. Bot. Bull. Mens. 3: 150, 151 (1929 publ. 1931)
Distribution: Madagascar
29 MDG
species :
Hydrostachys distichophylla A.Juss.; Icon. Sel. Pl. [Delessert] 3: t. 94 (1837)
Distribution: Madagascar
29 MDG
Synonyms: hidden
= Hydrostachys distichophylla var. humblotii Engl.; Bot. Jahrb. Syst. 20: 136 (1894)
= Hydrostachys humblotii (Engl.) H.Perrier; Arch. Bot. Bull. Mens. 3: 147 (1929 publ. 1931)
variant :
var. hildebrandtii (Engl.) C.Cusset; Adansonia, Sér. 2, 13(1): 84 (1972)
Distribution: Madagascar
29 MDG
Synonyms: hidden
= Hydrostachys hildebrandtii Engl.; Bot. Jahrb. Syst. 20: 136 (1894)
= Hydrostachys hildebrandtii f. boinensis (H.Perrier) H.Perrier; Fl. Madagasc., Fam. 89: 16 (1952)
= Hydrostachys hildebrandtii var. boinensis H.Perrier; Arch. Bot. Bull. Mens. 3: 149 (1929)
= Hydrostachys hildebrandtii var. nana (Engl.) H.Perrier; Fl. Madagasc., Fam. 89: 16 (1952)
= Hydrostachys nana Engl.; Bot. Jahrb. Syst. 20: 136 (1894)
= Hydrostachys nervosa H.Perrier; Arch. Bot. Bull. Mens. 3: 143 (1929 publ. 1931)
species :
Hydrostachys fimbriata C.Cusset; Adansonia, Sér. 2, 9: 448 (1969)
Distribution: Madagascar
29 MDG
species :
Hydrostachys flabellifera G.W.Hu, Zhun Xu & Q.F.Wang; PhytoKeys 167: 48 (2020)
Distribution: Madagascar
29 MDG
species :
Hydrostachys imbricata A.Juss.; Icon. Sel. Pl. [Delessert] 3: t. 92 (1837)
Distribution: Madagascar
29 MDG
Synonyms: hidden
= Hydrostachys imbricata var. cystiphora Tul.; Ann. Sci. Nat., Bot., Sér. 3, 11: 91 (1849)
= Hydrostachys imbricata var. thuarsiana Tul.; Ann. Sci. Nat., Bot., Sér. 3, 11: 91 (1849)
species :
Hydrostachys insignis Mildbr. & Reimann; Notizbl. Bot. Gart. Berlin-Dahlem 11: 662 (1932)
Distribution: SE-D.R.Congo [Zaire]; Tanzania; SW-Angola
23 ZAI 25 TAN 26 ANG
Synonyms: hidden
= Hydrostachys insignis var. congolana Hauman; Bull. Soc. Roy. Bot. Belgique 78: 55 (1946)
species :
Hydrostachys longifida H.Perrier; Arch. Bot. Bull. Mens. 3: 157, 158 (1929 publ. 1931)
Distribution: Madagascar
29 MDG
Synonyms: hidden
= Hydrostachys longifida var. brevifida H.Perrier; Fl. Madagasc., Fam. 89: 28 (1952)
species :
Hydrostachys lufirensis C.Cusset; Adansonia, Sér. 2, 13(1): 102 (1973)
Distribution: D.R.Congo [Zaire]
23 ZAI
species :
Hydrostachys lukungensis (Hauman) C.Cusset; Adansonia, Sér. 2, 13(1): 117 (1973)
Distribution: W-D.R.Congo [Zaire]
23 ZAI
Remarks: only known from two collections in 1921 and 1923
Synonyms: hidden
= Hydrostachys myriophylla var. lukungensis Hauman; Bull. Soc. Roy. Bot. Belgique 78: 56 (1946)
species :
Hydrostachys maximus H.Perrier; Arch. Bot. Bull. Mens. 3: 146, 147 (1929 publ. 1931)
Distribution: Madagascar
29 MDG
species :
Hydrostachys monoicus H.Perrier; Arch. Bot. Bull. Mens. 3: 144 (1929 publ. 1931)
Distribution: Madagascar
29 MDG
species :
Hydrostachys multifida A.Juss.; Icon. Sel. Pl. [Delessert] t. 93 (1837)
Distribution: Madagascar
29 MDG
Synonyms: hidden
= Hydrostachys goudotiana Tul.; Ann. Sci. Nat., Bot., Sér. 3, 11: 92 (1849)
= Hydrostachys longipoda H.Perrier; Arch. Bot. Bull. Mens. 3: 151, 152 (1929 publ. 1931)
= Hydrostachys madagascariensis Steud.; Nomencl. Bot. [Steudel], ed. 2, 1: 783 (1841)
= Hydrostachys rutenbergii Buchenau; Abh. Naturwiss. Verein Bremen 10: 375, t. 6 fig. l.8 (1889)
species :
Hydrostachys myriophylla Hauman; Bull. Soc. Roy. Bot. Belgique 78: 55 (1946)
Distribution: D.R.Congo [Zaire]
23 ZAI
species :
Hydrostachys perrieri C.Cusset; Adansonia, Sér. 2, 9: 444 (1969)
Distribution: Madagascar
29 MDG
species :
Hydrostachys plumosa A.Juss. ex Tul.; Arch. Mus. Hist. Nat. 6: 57 (1852)
Distribution: Madagascar
29 MDG
Synonyms: hidden
= Hydrostachys pinnatifolia Engl.; Bot. Jahrb. Syst. 20: 137 (1894)
species :
Hydrostachys polymorpha Klotzsch; Naturw. Reise Mossambique [Peters] 506. t. 52 (1864)
Distribution: D.R.Congo [Zaire]; SW-Tanzania; W-Angola; Malawi; Zimbabwe; Mozambique; Namibia; South Africa (KwaZulu-Natal)
23 ZAI 25 TAN 26 ANG MLW MOZ ZIM 27 NAM SAF
Synonyms: hidden
= Hydrostachys cristulata Wedd.; Prodr. [A.P. de Candolle] 17: 89 (1873)
= Hydrostachys multipinnata Engl.; Bot. Jahrb. Syst. 20(1-2): 137 (1894)
= Hydrostachys natalensis Wedd.; Prodr. [A.P. de Candolle] 17: 88 (1873)
species :
Hydrostachys stolonifera Baker; J. Linn. Soc., Bot. 21: 435 (1886)
Distribution: Madagascar
29 MDG
species :
Hydrostachys triaxialis Engl. & Gilg; Kunene-Sambesi-Exped. [Warburg] 241 (1903)
Distribution: SE-D.R.Congo [Zaire]
23 ZAI
species :
Hydrostachys trifaria H.Perrier; Arch. Bot. Bull. Mens. 3: 150 (1929 publ. 1931)
Distribution: Madagascar
29 MDG
variant :
var. multisquamata (Perr.) C.Cusset; Adansonia, Sér. 2, 13(1): 110 (1973)
Distribution: Madagascar
29 MDG
Synonyms: hidden
= Hydrostachys multisquamatus [Arch.Bot.Bull.Mens.3: 149, 150 (1929 publ.1931)]
species :
Hydrostachys verruculosa A.Juss.; Icon. Sel. Pl. [Delessert] 3: t. 91 (1837)
Distribution: Madagascar
29 MDG
Synonyms: hidden
= Hydrostachys laciniata Warm.; Kongel. Danske Vidensk. Selsk. Skr., Naturvidensk. Math. Afd., Ser. 6, 9: 152 (1899)
= Hydrostachys verruculosa f. ciliata H.Perrier; Arch. Bot. Bull. Mens. 3: 141 (1929)
= Hydrostachys verruculosa f. laciniata (Warm.) H.Perrier; Arch. Bot. Bull. Mens. 3: 141 (1929)
= Hydrostachys verruculosa f. sericea H.Perrier; Arch. Bot. Bull. Mens. 3: 142 (1929)
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A complete, synonymic checklist of the Higher Plants of the World


Version 25.11 (Nov. 11th, 2025)

Covering 357,753 accepted species,
8,806 hybrids, 48,075 accepted infraspecific taxa and 1,004,944 synonyms,
in total 1,419,578* names

[*about 25,000 dubious, "unplaced" names and about 4,000 invalid names (Art. 24.3) like "typicus" are deliberately omitted]


With complete, detailed distribution data (countries and regions) and literature references

Arranged in linear phylogenetic sequence reflecting true relationships

Fully searchable and continously updated

With 38,209 pictures of 15,787 species

Assembled through 40 years independently from other databases

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