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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.



Piet Vorster

Annual, generally perennial herb, shrub, aromatic or strong-smelling. Stem: generally erect. Leaf: alternate to ± opposite above; blade lobed to dissected, lobes generally crenate or serrate. Inflorescence: umbel, dense to open; flowers 3–many. Flower: ± bilateral [(radial)], nectary 1, deeply embedded into receptacle to form spur fused with pedicel; petals ± equal to strongly unequal, generally striped or marked, upper 2 generally > lower 3, different in shape, position, generally with marks of different and/or more intense color; fertile stamens 1–7, united at base. Fruit: body dehiscent, generally oblong, base acute, 1-seeded; beak segments stiff-hairy adaxially.
± 300 species: southern Africa, St. Helena, Asia Minor, Madagascar, Australia. (Greek: stork, from beaked fruit) [Bakker et al. 2005 in Bakker et al. (eds.) Plant Species-Level Syst:75–100. A.R.G. Gantner] Pelargonium ×domesticum, cultivated but evidently not escaped in California; Pelargonium quercifolium (L.) L'Hér., urban weed.
Unabridged references: [Bakker, F. T., Culham, A., Hettiarachi, P., Touloumenidou, T., & Gibby, M. 2004. Phylogeny of Pelargonium (Geraniaceae) based on DNA sequences from three genomes. Taxon 53: 17–28; Bakker, F. T., Culham, A., Marais, E. M., & Gibby, M. 2005. Nested radiation in Cape Pelargonium. Pp. 75–100, in Bakker, F. T., Chatrou, L. W., Gravendeel, B., & Pelser, P. B. (eds), Plant Species-Level Systematics: New Perspectives on Pattern and Process. A.R.G. Gantner, Ruggel, Liechtenstein. [Regnum Vegetabile vol. 143.]; Van der Walt 1985 Bothalia 15:345–385, 1977 Pelargoniums of s Africa vol. 1; Van der Walt & Vorster 1981 Pelargoniums of s Africa vol. 2; Van der Walt & Vorster 1988 Pelargoniums of s Africa vol. 3]

Key to Pelargonium

1. Leaf peltate, glabrous ..... [P. peltatum]

1' Leaf not peltate, glabrous or not

2. Leaf blade ± as long as wide

3. Leaf membranous, hairs 0 or sparse; petals pink-purple ..... [P. zonale]

3' Leaf ± succulent, hairs dense; petals red to white

4. Leaf blade 15–20 cm wide; petals red to white ..... P. ×hortorum

4' Leaf blade generally 4–8 cm wide; petals red ..... P. inquinans

2' Leaf blade longer than wide or wider than long

5. Flower < 10 mm wide; stem slender, < 3 mm diam ..... P. grossularioides

5' Flower 15–40 mm wide; stem stout, > 3 mm diam

6. Inflorescence ± lax; flower 30–40 mm wide; leaf blade abaxially hairier, of different color than adaxially ..... P. panduriforme

6' Inflorescence dense; flower 15–18 mm wide; leaf blade abaxially, adaxially equally hairy, of same color

7. Plant prostrate to sprawling; margins of lower leaves irregularly curled; inflorescence 8–20-flowered ..... [P. capitatum]

7' Plant erect; margins of lower leaves not curled; inflorescence 3–12-flowered ..... [P. vitifolium]


Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, [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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