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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

EUCALYPTUS EUCALYPTUS, GUM TREE

Matt Ritter

Tree, shrub. Stem: generally erect; bark shedding, smooth, or persistent near base (occasionally) or throughout, rough; twigs generally round. Leaf: juvenile generally opposite, horizontal, sessile, ± cordate, entire, glaucous; adult generally alternate, vertical, petioled, ± lanceolate, entire, glandular, glabrous, generally same color on both sides. Inflorescence: axillary, (1)3–many-flowered, stalked umbel or panicle-like cluster of such umbels. Flower: perianth (generally, entirety of calyx lobes, petals) fused into bud cap in bud, bud cap shed at flower; stamens many, in several series, generally all fertile, white (yellow, red, pink); ovary chambers 3–6, fused to hypanthium. Fruit: capsule, thick-walled, woody, generally smooth, generally dehiscing at top. Seed: generally 1–3 mm, wind-dispersed.
± 700 species: most endemic to Australia; > 250 species. Cult in California; important for oils, tannins, timber, orns. (Greek: true cap, for bud cap) [Brooker 2000 Austral Syst Bot 13:79–148] World's largest flowering plants, some > 100 m; Eucalyptus pulverulenta Sims excluded, cultivated only.

Key to Eucalyptus

E. pulchella Desf. WHITE PEPPERMINT
NATURALIZED
Stem: < 20 m, branches erect; bark shedding in long strips, smooth, occasionally shaggy or rough near base, white to blue-gray. Leaf: 5–10 cm, generally < 0.5 cm wide, linear, dark green, ± peppermint odor when crushed. Inflorescence: umbel, 9–15-flowered. Flower: hypanthium ± 2 mm, obconic, ± = bud cap; bud cap hemispheric; stamens white. Fruit: 4–6 mm, ovoid to cup-shaped; valves not exserted.
Uncommon. Disturbed areas; < 200 m. San Francisco Bay Area; native to southeastern Australia, rarely cultivated in California. Dec–Feb [Online Interchange]

Previous taxon: Eucalyptus polyanthemos
Next taxon: Eucalyptus sideroxylon

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Nov 23 2014
Citation for this treatment: [Author of taxon treatment] 2013. Eucalyptus, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=81244, accessed on Nov 23 2014

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Geographic subdivisions indicated for the distribution of Eucalyptus pulchella Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.