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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.

 

MYRTACEAE MYRTLE FAMILY

Leslie R. Landrum, except as noted


[Subshrub] shrub, tree, trunk bark smooth or scaly; glands 0 or embedded in epidermis. Leaf: opposite or alternate, persistent, generally glandular when young. Inflorescence: generally axillary, raceme, panicle, cyme, or flowers 1. Flower: generally bisexual, parts in 4s, 5s, generally ± white; hypanthium exceeding ovary or not; stamens generally many; ovary [rarely superior to] inferior, 2–5(18)-chambered; placentas axillary, just below top, or basal, ovules few to many, generally in 2–many series. Fruit: berry, capsule, nut. Seed: 1–many; coat membranous to ± leathery or hard, bony; embryo starchy or oily (of great taxonomic importance).
100 genera, ± 3500 species: many species tropical America, Australasia, fewer Africa, southern Asia; economically important for timber (Eucalyptus), spices (Syzygium aromaticum (L.) Merr. & L.M. Perry, cloves; Pimenta dioica (L.) Merr., allspice), edible fruits (Psidium guajava L., guava; Acca sellowiana (O. Berg) Burret, pineapple guava), many orns (Eucalyptus, Melaleuca, several other genera). [McVaugh 1968 Taxon 17:354–418] Apparently of Gondwanan origins; tropics, subtropics, Mediterranean climates. Chamelaucium uncinatum Schauer, Luma apiculata (DC.) Burret, Melaleuca citrina (Curtis) Dum.Cours., Myrtus communis L., Syzygium australe (Link) B. Hyland are waifs. —Scientific Editor: Thomas J. Rosatti.
Unabridged references: [McVaugh 1968 Taxon 17:354–418; Wilson et al. 2005 Plant Syst Evol 251:3–19]

Key to Myrtaceae

1. Fruit a berry; seeds often > 5 mm; leaves generally opposite (whorled).

2. Calyx lobes, petals 5; seed coat shiny, hard ..... [MYRTUS]

2' Calyx lobes, petals 4; seed coat membranous

3. Ripe fruit dark purple; seeds generally > 1, lenticular; colyledons ± = embryonic stem ..... [LUMA]

3' Ripe fruit red or purple; seed generally 1, spheric; cotyledons >> embryonic stem ..... [SYZYGIUM]

1' Fruit a capsule or nut; seeds generally 1–3 mm; mature leaves alternate or opposite

4. Perianth parts fused into bud cap in bud, shed at flower as a unit ..... EUCALYPTUS

4' Perianth parts free in bud, each segment persistent or falling separately

5. Flowers in a dense cylindrical cluster surrounding stem at tip or just below; stamens several × > perianth ..... MELALEUCA

5' Flowers 1 or in small clusters, not surrounding stem; stamens <= perianth

6. Leaves opposite, linear or awl-shaped; fruit a 1-chambered nut; style with ring of hairs just below stigma ..... [CHAMELAUCIUM]

6' Leaves alternate, oblanceolate to obovate-oblong; fruit a many-chambered capsule; style glabrous ..... LEPTOSPERMUM

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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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