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Key to GeraniumView taxon page for Geranium
(For a list of species in Geranium, use the above link.) Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots. 1. Perennial herb, from thick, scaly, underground caudex  Generally short, sometimes woody, more or less vertical stem of a perennial, at or beneath ground level. 2' Inflorescence 2-flowered 3. Mericarp without basal  At or near the base of a plant or plant part. Especially said of leaves clustered near the ground or of a placenta confined to the base of an ovary. callus ..... [G. palmatum; G. pyrenaicum] 3a. Petals 19–21 mm; leaf  Organ arising from a stem, generally composed of a stalk (petiole) and a flat, expanded, green, photosynthetic area (blade); distinguished from a leaflet by the presence in its axil of a bud, branch, thorn, or flower; sometimes with lateral, basal appendages (stipules); either simple (toothed, lobed, or dissected but not divided into leaflets) or compound (divided into leaflets). divided > 0.9 to base or midrib ..... G. palmatum [evidently known only from ± urban environments in California] 3a' Petals 7–11 mm; leaf divided 0.5–0.6 to base ..... G. pyrenaicum [neither naturalized nor escaped in California; collected only once, in 1914, on UC Berkeley campus] 3' Mericarp with basal callus 4. Petals glabrous adaxially, ciliate  Having generally straight, conspicuous hairs along margins or edges. at base 5' Petals 3–8.1 mm; fruit beak 8.8–15.1 mm 6. Pedicel hairs reflexed  Abruptly bent or curved downward or backward. , appressed  Parallel or nearly parallel to and often in contact with surface of origin; used to describe the disposition of hairs, leaves, pedicels, etc. , 0.2–0.6 mm ..... G. core-core 6' Pedicel hairs spreading  Oriented more or less perpendicularly to the axis of attachment; often, more or less horizontal. or reflexed, not appressed, 0.2–2 mm ..... G. solanderi 4' Petals 1/3–3/4 hairy adaxially, ciliate at base or not 7' Nectaries glabrous abaxially, hair-tufted at top; petals white to red-purple; stigmas 3–8 mm 1' Annual, biennial, from short, ± slender roots 9' Fertile stamens 10 (inner 5 and outer 5 all with anthers) 10' Sepals without flaps or keels 11. Mericarp ribbed or ± net-like or transversely wrinkled 12. Mericarp without collar-like rings or fibers at tip, transversely wrinkled ..... G. molle 12' Mericarp with 1–5 collar-like rings and long fibers at tip, ribbed or ± net-like 11' Mericarp smooth (although sometimes ± ribbed or hairy or bristly) 14' Mericarp base without prong, generally with callus 15' Mericarp ± hairy throughout except basal callus bristly 16. Fruit beak with a narrow tip < 2 mm 17. Pedicel hairs spreading, glandular and nonglandular, sometimes also reflexed, not appressed, nonglandular; mericarp hairs dense, 0.5–1.8 mm ..... G. carolinianum 17' Pedicel hairs reflexed, appressed, nonglandular; mericarp hairs sparse, 0.2–0.7 mm ..... [G. texanum] 16' Fruit beak with a narrow tip 2–6 mm 18' Peduncles with glandular hairs
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Citation for the whole project: Jepson Flora Project (eds.) . Jepson eFlora, https://ucjeps.berkeley.edu/eflora/ [accessed on ]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on .
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