|
|
Key to LathyrusView taxon page for Lathyrus
(For a list of species in Lathyrus, use the above link.) Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots. 1. Leaflets 2; generally of disturbed habitats 3. Inflorescence 4–15-flowered; wings of stem, petiole  Leaf stalk, connecting leaf blade to stem; sometimes more or less indistinct. often >= 2 mm wide ..... L. latifolius 3' Inflorescence 2–4-flowered; wings of stem, petiole < 2 mm wide 4. Fruit hairy; leaflets ovate  Egg-shaped (i.e., widest below the middle) in two dimensions (i.e., in one plane), as a leaf. to narrowly elliptic  In the shape of a flattened circle or ellipse; wider than linear , length 1.2–3 × width ..... L. odoratus 4' Fruit glabrous; leaflets lanceolate  Narrowly elongate, widest in the basal half, often tapered to an acute tip. to widely ovate, length 1.2–6.5 × width ..... L. tingitanus 5. Fruit hairy; inflorescence 1–2-flowered; calyx tube ± = lobes  1. A major expansion or bulge, such as on the margin of a leaf, sepal, or petal, or on the surface of an ovary. 2. The free tips of otherwise fused structures, such as sepals or petals; larger than teeth. ..... L. hirsutus 5' Fruit glabrous; inflorescence 1-flowered; calyx tube ± <= lobes 6. Inflorescence axis not extended beyond flower; calyx tube << lobes; corolla red-purple ..... L. cicera 6' Inflorescence axis extended as bristle beyond flower; calyx tube ± <= lobes; corolla not red-purple 1' Leaflets 2–16, > 2 at least on some leaves; generally of natural habitats 8' Leaflet, fruit not gland-dotted; leaflets often < 14 9. Stem with wings ± >= 1 mm wide 10. Leaflets (4)6(8), opposite  1. Arranged in pairs along an axis - e.g., two leaves per node. 2. Occurring in the same rank, directly above or below, as 'stamens opposite petals'. 3. Located directly across from. ; immediate coast, n NCo ..... L. palustris (2) 10' Leaflets generally 8–16, irregularly arranged; immediate coast only in n CCo 11. Corolla 10–15 mm, white, generally lavender-striate, fading yellow-tan; nw KR (Del Norte, w Siskiyou cos.) ..... L. delnorticus (2) 9' Stem with angles or flanges < 1 mm wide 13. Tendrils not coiled or branched, often a short bristle 14. Stipule ± >= leaflet  A leaf-like unit of a compound leaf; distinguished from a leaf by the absence in its axil of a bud, branch, thorn, or flower; lacking lateral, basal appendages (stipules); either simple (leaf 1-compound, with primary leaflets) or compound (leaf 2-compound, with primary and secondary leaflets; 3-compound, with primary, secondary, and tertiary leaflets, etc). ; generally dunes, beaches of immediate coast – NCo, n&c CCo 14' Stipule < leaflet; not of immediate coast 16. Inflorescence 1–2-flowered; leaflet generally 0.5–2 cm; fruit glabrous or puberulent 17. Leaflets 10–15, elliptic to ovate, 1–2 cm; fruit puberulent – NCo, NCoR, SnFrB ..... L. torreyi 17' Leaflets 4–8, generally oblong  Longer than wide, with nearly parallel sides; wider than linear. or narrowly lanceolate to linear  Elongate, with nearly parallel sides; narrower than elliptic or oblong. ; fruit glabrous 18. Leaflets 4, lance-oblong, generally 0.5–1(2) cm; corolla green-white, dark-striate; NCoRH (Red Mtn, Humboldt Co.) ..... L. biflorus 16' Inflorescence 2–16-flowered; leaflet 1–8 cm; fruit glabrous 19. Stems erect  Upright; vertically oriented. , many, clustered; inflorescence dense; corolla white to pink, 17–23 mm; MP (Modoc Co.) ..... L. rigidus 19' Stems erect or sprawling, 1–few, clustered; inflorescence open or dense; corolla lavender to pink-purple or, if white, < 17 mm; n CA-FP 20. Leaflets 10–16, subopposite to alternate  1. Arranged singly, often spirally, along an axis - e.g., one leaf per node. 2. Occurring in different ranks, appearing to be between, not directly above or below, as 'stamens alternate petals'. ; stipules in width often ± = leaflets; plant glabrous – KR, n&c NCoR ..... L. polyphyllus (3) 20' Leaflets 4–10, irregularly arranged or opposite; stipules in width generally ± <= leaflets; plant often hairy 21' Corolla 7–12 mm; leaflets generally linear to lanceolate, irregularly arranged or opposite ..... L. lanszwertii 13' Tendrils, at least on some leaves, coiled and generally branched 23. Leaflets ± = stipules, 6–8; coastal beaches, dunes – NCo (Del Norte, Humboldt cos.) ..... L. japonicus (2) 23' Leaflets generally > stipules, 6–8 or not; generally inland 24. Corolla white-yellow to bronze-orange (drying tan or dark), 11–14 mm; banner reflexed  Abruptly bent or curved downward or backward. above middle; inflorescence 10–15-flowered, dense, generally 1-sided – flower appearing wide, blocky; KR, NCoR, SN ..... L. sulphureus 24' Corolla not white-yellow (except Lathyrus lanszwertii var. tracyi) to bronze-orange (occasionally fading tan-yellow), 11–14 mm or not; banner reflexed or bent from middle or below; inflorescence 1–15-flowered, generally ± open (1-sided) 25. Corolla wine-red to crimson, 25–35 mm; banner reflexed 120–180° – s SCo, PR (San Diego Co.) ..... L. splendens 25' Corolla white to purple, 8–25 mm; banner bent ± 90° 26. Leaflets (4)6(8), opposite, glabrous or ± puberulent, flowers 3–6 per inflorescence, 15–20 mm; immediate coast, n NCo ..... L. palustris (2) 26' Leaflets, flowers not entirely as above; immediate coast only in n CCo 27' Stipules < 1 cm wide and leaflets <= 12 or plants not of KR, NCoR 28' Inflorescence occasionally 2–16-flowered; not DMoj 29. Corolla white or cream, fading yellow-tan (occasionally to lavender in Lathyrus vestitus var. ochropetalus) – NW 30. Stem flanged or narrowly winged; stipules widely triangular, 0.5–0.8 cm wide; nw KR (Del Norte, w Siskiyou cos.) ..... L. delnorticus (2) 30' Stem angled or ± flanged; stipules generally lanceolate, < 0.5 mm wide; NW 29' Corolla purple, lavender, or ± red (occasionally to white in Lathyrus nevadensis var. nevadensis) 32' Stipules < 1 cm wide; leaflets 4–12 33. Flowers often crowded, generally 8–14, corolla 14–20 mm; leaflets 8–12, generally subopposite to alternate; w CA-FP ..... L. vestitus 34. Corolla wine red to dark purple, 16–20 mm; banner generally reflexed > 90°; SCo, s ChI, PR ..... var. alefeldii 33' Flowers generally spaced, either 2–10 and corollas 8–16 mm or 2–4 and corollas 13–25 mm; leaflets 4–10, opposite or subopposite; especially KR, CaR, SN 35' Leaflets generally subopposite or irregularly arranged, ovate to linear; inflorescence 2–10-flowered; corolla 8–16 mm 36. Stipules widely ovate-triangular, often toothed, conspicuous; calyx glabrous except lobes often finely ciliate  Having generally straight, conspicuous hairs along margins or edges. ; corolla generally 10–14 mm, banner upcurved above other petals ..... L. brownii
Please use this Google Form for Contact/Feedback
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 .
We encourage links to these pages, but the content may not be downloaded for reposting, repackaging, redistributing, or sale in any form, without written permission from The Jepson Herbarium.
|
|
|