Littleleaf ceanothus Ceanothus parvifolius, copyright Dcrjsr.

Belongs within: Rhamnaceae.

Ceanothus, California lilac, is a North American genus of shrubs and small trees with showy flowers (Hickman 1993).

Characters (from Hickman 1993): Shrub, small tree, prostrate to erect, thorny or not. Stem with branches generally arranged as leaves. Leaves alternate or opposite, deciduous or evergreen, petioled; blade 1–3-ribbed from base, margin entire or not. Inflorescence generally panicle-like aggregations of umbel-like 3-flowered clusters. Flower generally >5 mm; hypanthium surrounding fleshy disk below ovary base, in fruit thick, not splitting; sepals generally 5, lanceolate-deltate, incurved, colored like petals, persistent; petals generally 5, hooded, white to deep blue; stamens generally 5, opposite petals; ovary superior, 3-lobed. chambers 3, each 1-ovuled, style parts 3. Fruit a capsule, more or less spheric, 3-valved. Seeds 3, approximately 3 mm, one surface convex.

|--C. americanusSK93
|--C. arboreus [incl. C. arboreus var. glabra]H93
|--C. azureusSK93
|--C. buxifoliusSK93
|--C. caeruleusAD84
|--C. confusus [=C. divergens ssp. confusus]H93
|--C. cordulatusRJ11
|--C. crassifolius [incl. C. crassifolius var. planus]H93
|--C. cuneatusSK93
| |--C. c. var. cuneatus [incl. C. cuneatus var. dubius, C. cuneatus var. submontanus]H93
| |--C. c. var. fascicularisH93
| `--C. c. var. rigidus [incl. C. rigidus var. albus]H93
|--C. cyaneusH93
|--C. dentatus [incl. C. dentatus var. floribundus]H93
|--C. divaricatusSK93
|--C. divergensH93
|--C. diversifoliusH93
|--C. fendleriSK93
|--C. ferrisaeH93
|--C. foliosusH93
| |--C. f. var. foliosusH93
| |--C. f. var. mediusH93
| `--C. f. var. vineatusH93
|--C. fresnensisH93
|--C. gloriosusH93
| |--C. g. var. gloriosusH93
| |--C. g. var. exaltatusH93
| `--C. g. var. porrectusH93
|--C. greggiiRJ11
| |--C. g. var. greggiiH93
| |--C. g. var. perplexansH93
| `--C. g. var. vestitusH93
|--C. griseus [incl. C. griseus var. horizontalis]H93
|--C. hearstiorumH93
|--C. impressus [incl. C. impressus va. nipomensis]H93
|--C. incanusH93
|--C. integerrimus [incl. C. i. var. californicus, C. i. var. macrothyrsus, C. i. var. puberulus]H93
|--C. jepsoniiH93
| |--C. j. var. jepsoniiH93
| `--C. j. var. albiflorusH93
|--C. lemmoniiH93
|--C. leucodermisNT01
|--C. × lorenzeniiH93
|--C. maritimusH93
|--C. masoniiH93
|--C. megacarpusH93
| |--C. m. var. megacarpus [incl. C. megacarpus var. pendulus]H93
| `--C. m. var. insularisH93
|--C. microphyllusSK93
|--C. oliganthus [incl. C. oliganthus var. orcuttii]H93
|--C. ophiochilusH93
|--C. × otayensisH93
|--C. ovatusS72
|--C. palmeriH93
|--C. papillosusH93
| |--C. p. var. papillosusH93
| `--C. p. var. roweanusH93
|--C. parryiH93
|--C. parvifoliusH93
|--C. pinetorumH93
|--C. prostratus [incl. C. prostratus var. laxus, C. prostratus var. occidentalis]H93
|--C. pumilusH93
|--C. purpureusH93
|--C. roderickiiH93
|--C. sanguineusSK93
|--C. sonomensisH93
|--C. sorediatusSK93 [=C. oliganthus var. sorediatusH93]
|--C. spinosusH93
|--C. thyrsiflorus [incl. C. thyrsiflorus var. repens]H93
|--C. tomentosus [incl. C. tomentosus var. olivaceous]H93
|--C. velutinusH93
| |--C. v. var. velutinusH93
| `--C. v. var. hookeriH93
`--C. verrucosusH93

*Type species of generic name indicated


[AD84] Axelrod, D. I., & T. A. Deméré. 1984. A Pliocene flora from Chula Vista, San Diego County, California. Transactions of the San Diego Society of Natural History 20 (15): 277–300.

[H93] Hickman, J. C. (ed.) 1993. The Jepson Manual: Higher Plants of California. University of California Press: Berkeley (California).

[NT01] Newton, A. F., M. K. Thayer, J. S. Ashe & D. S. Chandler. 2001. Staphylinidae Latreille, 1802. In: Arnett, R. H., Jr & M. C. Thomas (eds) American Beetles vol. 1. Archostemata, Myxophaga, Adephaga, Polyphaga: Staphyliniformia pp. 272–418. CRC Press: Boca Raton.

[RJ11] Rising, J. D., A. Jaramillo, J. L. Copete, P. G. Ryan & S. C. Madge. 2011. Family Emberizidae (buntings and New World sparrows). In: Hoyo, J. del, A. Elliott & D. A. Christie (eds) Handbook of the Birds of the World vol. 16. Tanagers to New World Blackbirds pp. 428–683. Lynx Edicions: Barcelona.

[SK93] Schirarend, C., & E. Köhler. 1993. Rhamnaceae Juss. World Pollen and Spore Flora 17/18: 1–53.

[S72] Shields, O. 1972. Flower visitation records for butterflies (Lepidoptera). Pan-Pacific Entomologist 48 (3): 189–203.

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