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Key to families | Table of families and genera

Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.

 

LYTHRACEAE LOOSESTRIFE FAMILY

Shirley A. Graham


Annual, perennial herb, shrub, tree. Stem: 4-angled or cylindric. Leaf: simple, entire, generally opposite, 4-ranked (alternate, whorled). Inflorescence: flowers terminal or in axils of upper leaves or leaf-like bracts, 1 or in ± dense cymes or along short shoots, sessile or not, subtended by [0]2 bractlets. Flower: bisexual, generally radial; hypanthium bell-shaped to cylindric, membranous or leathery, persistent in fruit; sepals appearing as hypanthium lobes, 4–9, epicalyx lobes alternate sepals or 0; petals, stamens inserted on inner hypanthium; petals 4–6 or 0, alternate sepals, crinkled, deciduous; stamens generally = or 2 × sepals, included or exserted; ovary generally superior, chambers 2–6[many], style generally slender, stigma head-like. Fruit: dry capsule or leathery berry, dehiscent into 2–4 valves or irregularly. Seed: 3–many.
± 28 genera, 600 species: temperate, tropics, generally in wet habitats. Some ornamental or cultivated for medicine, dyes. [Graham et al. 2005 Int J Plant Sci 166:995–1017] "Epicalyx lobes" (lobes on calyx) formerly called "appendages," "hypanthium" in Lythraceae (and Onagraceae) including receptacle, sometimes called "flower cup" or "flower tube". Punicaceae (Punica) included here. —Scientific Editor: Thomas J. Rosatti.

Key to Lythraceae

1. Hypanthium leathery, 2–5 cm, wall smooth; ovary inferior; sepals 5–9 ..... PUNICA

1' Hypanthium membranous, 2–8 mm, wall 4–12-ribbed; ovary superior; sepals 4–6

2. Hypanthium cylindric, > 2 × longer than wide ..... LYTHRUM

2' Hypanthium bell- to urn-shaped, < 2 × longer than wide

3. Leaf with basal ear-like lobes; flowers in dense axillary cymes ..... AMMANNIA

3' Leaf narrowly tapered to base; flowers 1 per axil on main shoots and on short axillary shoots

4. Sepals, stamens generally 6; hypanthium broadly bell-shaped ..... Lythrum portula

4' Sepals, stamens generally 4; hypanthium bell- to ± urn-shaped ..... ROTALA

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Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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