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LAMIACEAE (Labiatae) MINT FAMILY

Dieter H. Wilken & Margriet Wetherwax, family description, key to genera

Annual to shrub [tree, vine], glabrous to hairy, generally aromatic. Stem: generally erect, generally 4-angled. Leaf: generally simple to deeply lobed, generally opposite, generally gland-dotted. Inflorescence: generally cymes, generally many in dense axillary clusters surrounding stem, generally separated by evident internodes or collectively crowded, spike- or panicle-like, occasionally head-like or raceme, subtended by leaves or bracts; flowers sessile or pedicelled. Flower: generally bisexual; calyx generally 5-lobed, radial to bilateral; corolla generally bilateral, 1–2-lipped, upper lip entire or 2-lobed, ± flat to hood-like, occasionally 0, lower lip generally 3-lobed; stamens generally 4, epipetalous, generally exserted, paired, pairs generally unequal, occasionally 2, staminodes 2 or 0; ovary superior, generally 4-lobed to base chambers 2, ovules 2 per chamber, style 1, generally arising from center at junction of lobes, stigmas generally 2. Fruit: generally 4 nutlets, generally ovoid to oblong, smooth.
± 230 genera, 7200 species: worldwide. Many cultivated for herbs, oils (Lavandula, lavender; Mentha, mint; Rosmarinus, rosemary; Thymus, thyme), some cultivated as ornamental (in California Cedronella, Leonotis, Monarda, Phlomis). [Harley et al. 2004 Fam Generally Vasc Plant 7:167–275] Moluccella laevis L., shell flower, historical waif in California. Satureja calamintha (L.) Scheele subsp. ascendens (Jordan) Briq. reported as alien but not naturalized. Salazaria moved to Scutellaria; California Hyptis moved to Condea, California Satureja moved to Clinopodium. —Scientific Editors: Douglas H. Goldman, Bruce G. Baldwin.

Key to Lamiaceae

ACANTHOMINTHA THORNMINT

John M. Miller & James D. Jokerst

Annual, hairy or not, aromatic. Stem: erect, branched or not. Leaf: petioled; blade lanceolate to obovate, entire to spiny. Inflorescence: clusters, head-like, terminal and generally axillary; bracts generally scarious, veins conspicuous, margins spiny. Flower: calyx 2-lipped, lobes spine-tipped, upper 3 acuminate, lower 2 oblong; corolla funnel-shaped, 2-lipped, white, occasionally tinged lavender or rose, throat cream, upper lip 2-lobed to entire, hooded, lower lip 3-lobed, reflexed; stamens 4, upper 2 reduced, sterile or not; style slender, lower lobe longer. Fruit: smooth, ovoid.
4 species: southern California Floristic Province. (Greek: thorn mint) [Wagstaff et al. 1998 Plant Syst Evol 209:265–274]
Unabridged references: [Jokerst 1991 Madroño 38:278–286]

Key to Acanthomintha

A. obovata Jeps.
NATIVE
Stem: 4–25 cm, generally branched proximally; hairs 0 to sparse, short or long, some inconspicuously glandular. Leaf: blade 8–12 mm, ovate or obovate; margin of proximal entire to serrate, distal spiny. Inflorescence: bracts 7–15 mm, shiny, straw-colored at flower, marginal spines 7, 9, or 11, 5–8 mm. Flower: calyx 7–13 mm, hairs occasionally glandular; corolla 12–27 mm, white, lobes purple-tipped, upper lip < lower, entire, shallowly hooded; upper stamens fertile, anthers long-hairy, cream, pollen cream.
2n=38. [Online Interchange]

A. obovata subsp. cordata Jokerst HEART-LEAVED THORNMINT
NATIVE
Stem: hairs 0 to short, not glandular. Inflorescence: bracts round or wider than long, cordate-clasping at base. Flower: calyx hairs 0 to short; anthers densely woolly.
Grassy slopes, oak woodland, chaparral; < 1600 m. Outer South Coast Ranges, w&c Western Transverse Ranges. Apr–Jul [Online Interchange] {CNPS list}

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Oct 25 2014
Citation for this treatment: [Author of taxon treatment] 2013. Acanthomintha, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=48979, accessed on Oct 25 2014

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click for enlargement Acanthomintha obovata subsp. cordata
See CalPhotos for additional images
2003 Christopher L. Christie

Geographic subdivisions indicated for the distribution of Acanthomintha obovata subsp. cordata 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.