Jepson eFlora: Key page
Vascular Plants of California
Key to families | Table of families and genera
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Key to Araceae

View taxon page for Araceae

 

Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.

1. Plants not reduced, clearly differentiated into stemsleaves; floating aquatics or not; inflorescence, conspicuous; perianth parts 0, 4, 6; stamens 0, 2, 3, 4, 6 (genera treated as Araceae in TJM (1993), minus Acorus)

2. Plant aquatic, floating; inflorescence ± , inconspicuous among  leaves ..... [PISTIA]

2' Plant terrestrial or near edge of water; inflorescence peduncled, ± conspicuous

3. Petiole ; inflorescence  yellow ..... LYSICHITON

3' Petiole ± >= leaf blade; inflorescence bract sometimes pale yellow-green but not yellow

4. Peduncle ± >= leaf; inflorescence bract white both surfaces (tip generally pale green) ..... ZANTEDESCHIA

4' Peduncle generally << leaf; inflorescence bract abaxially pale yellow-green, adaxially ± white to pale yellow-green or dark purple, or green both surfaces (margins pale green to white or not)

5. Inflorescence sterile in ± upper 1/2, flowers only in lower 1/2; inflorescence bract abaxially pale yellow-green, adaxially ± white to pale yellow-green or dark purple ..... ARUM

5' Inflorescence fertile throughout; inflorescence bract green both surfaces (margins pale green to white or not) ..... [Peltandra virginica]

1' Plants much reduced, not differentiated into stems, leaves; floating aquatics; inflorescence 1-flowered, inconspicuous; perianth parts 0; stamens 1, 2 (genera treated as Lemnaceae in TJM (1993))

6. Roots 0 (see also Lemna trisulca)

7. Plant body ±  to nearly spheric, 0.4–1.3 mm ..... WOLFFIA

7' Plant body flat,  to , 3–10 mm ..... WOLFFIELLA

6' Roots present

8. Root generally 1 ..... LEMNA

8' Roots generally 2–16

9. Roots generally 2–7; plant body 3–5 mm, veins 3–7; winter  0 ..... LANDOLTIA

9' Roots generally 7–16; plant body 5–10 mm, veins 7–12; winter buds produced ..... SPIRODELA

 

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Citation for the whole project: Jepson Flora Project (eds.) . Jepson eFlora, http://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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