Hydrophylloideae

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Asterids
Cladus: Lamiids
Ordo: Boraginales

Familia: Boraginaceae
Subfamilia: Hydrophylloideae
Genera: Draperia – Ellisia – Emmenanthe – Eucrypta – Hesperochiron – Howellanthus – Hydrophyllum – Nemophila – Phacelia – Pholistoma – Romanzoffia – Tricardia

Name

Hydrophylloideae Burnett, Outlines Bot.: 1006, 1095, 1105. (1835)

Type genus: Hydrophyllum L. Sp. Pl. 1: 146. (1753)

Synonyms

Homotypic
Hydrophyllaceae R.Br. Bot. Reg. 3: ad t. 242. (1817) (as "Hydrophylleae") nom. cons. nom. alt.

References

Burnett, G.T. 1835. Outlines of Botany, including a general history of the vegetable kingdom. Vol. 1–2, 1190 pp., London: John Churchill. Archive.org Reference page. : 1006, 1095, 1105.
Angiosperm Phylogeny Group. 2016. An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG IV. Botanical Journal of the Linnean Society 181(1): 1–20. DOI: 10.1111/boj.12385 Reference page.
Luebert, F., Cecchi, L., Frohlich, M.W., Gottschling, M., Guilliams, C.M., Hasenstab-Lehman, K.E., Hilger, H.H., Miller, J.S., Mittelbach, M., Nazaire, M. & Nepi, M. 2016. Familial classification of the Boraginales. Taxon 65(3): 502–522. DOI: 10.12705/653.5 Full text PDF from ResearchGate Reference page. as Hydrophyllaceae
Stevens, P.F. 2001 onwards. Angiosperm Phylogeny Website. Version 14, July 2017 [and more or less continuously updated since]. Online. Reference page. as Hydrophyllaceae

Vernacular names
English: Waterleaf family

Hydrophylloideae is a subfamily of the flowering plant family Boraginaceae. Their taxonomic position is somewhat uncertain. Traditionally, and under the Cronquist system, they were given family rank under the name Hydrophyllaceae, and treated as part of the order Solanales. More recent systems have recognised their close relationship to the borage family, Boraginaceae, initially by placing Hydrophyllaceae and Boraginaceae together in an order Boraginales,[1] and most recently by demoting Hydrophyllaceae to a subfamily of Boraginaceae. However the placement and circumscription of Boraginaceae is still uncertain: it is unplaced at order level, and there is some prospect of it being split up again in future.[2]

Plants in this subfamily may be annual or perennial herbs or shrubs, with either a prostrate or an erect stem. Most have a taproot. The flowers are bisexual, and normally radial, with 5 petals and 5 stamens. About 20 genera, containing around 300 species, are recognised; many of them are native to the western United States.

The subfamily takes its name from the genus Hydrophyllum (waterleaf). Well known members include Emmenanthe (whispering bells), Nemophila (baby blue eyes) and Phacelia (scorpionweed).
Genera

Codon
Draperia
Ellisia
Emmenanthe
Eriodictyon
Eucrypta
Hesperochiron
Hydrophyllum
Lemmonia
Miltitzia
Nama
Nemophila
Phacelia
Pholistoma
Romanzoffia
Tricardia
Turricula
Wigandia

References

e.g. Gottschling, M., Hilger, H.H., Wolf, M. & Diane, N. (2001). Secondary structure of the ITS1 transcript and its application in a reconstruction of the phylogeny of Boraginales. Pl. Biol. 3: 629–636.
"Gentianales".