Hydrophylloideae is a subfamily of the plant family Boraginaceae. Its taxonomic position is somewhat uncertain. Traditionally, and under the Cronquist system, the taxon was given family rank under the name Hydrophyllaceae, and treated as part of the order Solanales. More recent systems have recognised a close relationship to the borage family, Boraginaceae, initially by placing Hydrophyllaceae and Boraginaceae together in an order Boraginales,[1] and in the 2016 APG IV system by including Hydrophyllaceae in Boraginaceae.[2] However, the placement and circumscription of Boraginaceae is still uncertain. Some sources now split off Hydrophyllaceae again (together with Namaceae).[3][4]
| Hydrophylloideae | |
|---|---|
| |
| Hydrophyllum occidentale | |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Boraginales |
| Family: | Boraginaceae |
| Subfamily: | Hydrophylloideae Burnett |
| Genera | |
|
See text | |
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.[citation needed]
The subfamily takes its name from the genus Hydrophyllum (waterleaf). Members include Emmenanthe (whispering bells), Nemophila (baby blue eyes) and Phacelia (scorpionweed).[5]
Genera
editAs of November 2024[update], the Angiosperm Phylogeny Website accepted the family Hydrophyllaceae rather than the subfamily Hydrophylloideae, and included 12 genera:[5]
- Draperia Torr. ex A.Gray
- Ellisia L.
- Emmenanthe Benth.
- Eucrypta Nutt.
- Hesperochiron S.Wats.
- Howellanthus (Constance) Walden & R.Patt.
- Hydrophyllum L.
- Nemophila Nutt.
- Phacelia Juss.
- Pholistoma Lilja
- Romanzoffia Cham.
- Tricardia Torr. ex S.Watson
Four further genera were accepted by the Angiosperm Phylogeny Website, but placed in the family Namaceae:[6]
- Eriodictyon Benth.
- Nama L.
- Turricula J.F.Macbr.
- Wigandia Kunth
The division into two families rather than one subfamily follows the recommendations of the Boraginales Working Group.[7]
References
edit- ^ 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.
- ^ 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.
- ^ Vasile, Maria-Anna; Jeiter, Julius; Weigend, Maximilian & Luebert, Federico (2020). "Phylogeny and historical biogeography of Hydrophyllaceae and Namaceae, with a special reference to Phacelia and Wigandia". Systematics and Biodiversity. 18 (8): 757–770. Bibcode:2020SyBio..18..757V. doi:10.1080/14772000.2020.1771471. hdl:20.500.11811/11843.
- ^ Stevens, P.F. (2001 onwards). "Boraginaceae". Angiosperm Phylogeny Website. Retrieved 2024-11-11.
- ^ a b Stevens, P.F. (2001 onwards). "List of Genera in Hydrophyllaceae". Angiosperm Phylogeny Website. Retrieved 2024-11-11.
- ^ Stevens, P.F. (2001 onwards). "List of Genera in Namaceae". Angiosperm Phylogeny Website. Retrieved 2024-11-11.
- ^ Hilger, H.H. & Cole, T.C.H. (2020). "Boraginales Phylogeny Poster". Retrieved 2024-11-12.
External links
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