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Flaveria linearis

(Narrowleaf Yellowtops)

Overview

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Interesting Facts

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Common Names

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Common Names in English:

Narrowleaf Yellowtops, Yellow-Top Flaveria, Yellowtop

Description

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Family Compositae

The largest family of flowering plants , the Compositae (Asteraceae), comprising about 1,100 genera and more than 20,000 species and characterized by many small flowers arranged in a head looking like a single flower and subtended by an involucre of bracts. A head may consist of both ray flowers and disk flowers, as in the sunflower, of disk flowers only, as in the burdock, or of ray flowers only, as in the dandelion.

Genus Flaveria

Annuals , perennials , or subshrubs , to 200+ cm [trees to 400 cm] (usually ± succulent, herbage usually glaucous). Stems (often purplish) erect or decumbent , branched distally or ± throughout. Leaves cauline; opposite (decussate) ; petiolate or sessile (weakly connate to connate-perfoliate ) ; blades (often 3-nerved) oblong-ovate to lanceolate or linear , margins entire, serrate, or spinulose-serrate, faces glabrous or short-pubescent. Heads radiate or discoid , usually in tight or loose aggregations in (often flat-topped) ± corymbiform arrays or glomerules . Involucres oblong , urceolate , cylindric , or turbinate , 0.5-2 mm diam. Phyllaries persistent , 2-6(-9) in ± 1 series (linear, concave , or boat-shaped , subequal ). Receptacles convex , epaleate ("receptacles" of glomerules sometimes setose ). Ray florets 0-1(-2), pistillate , fertile ; corollas yellow or whitish (laminae inconspicuous). Disc florets 1-15, bisexual , fertile; corollas yellow, tubes shorter than to about equaling funnelform to campanulate throats , lobes 5, ± deltate. Cypselae (black) weakly compressed , narrowly oblanceolate or linear-oblong (usually 10-nerved, glabrous) ; pappi usually 0, sometimes persistent, of 2-4 hyaline scales , or coroniform (of connate scales). x = 18.

Species 21: United States, Mexico, West Indies (Greater Antilles), Central America, South America, Asia (India), Africa, Australia.

Members of Flaveria are frequently found in alkaline , saline, and gypseous soils, often in disturbed and moist areas. Heads of Flaveria may be either radiate or discoid; when both are present in the same capitulescence , the discoid heads tend to be central and the radiate heads peripheral. Many species of Flaveria have persistent sheathing leaf bases that ring the stems after the leaves have fallen.

Flaveria is notable because certain species exhibit C3 photosynthesis, some C3-C4 (intermediate) photosynthesis, and others (F. brownii, F. bidentis, F. campestris, and F. trinervia in the United States) classic C4 photosynthesis.[1]

Physical Description

Species Flaveria linearis

Perennials , 30-80 cm (glabrous or pubescent , mostly on distal peduncles). Stems erect . Leaves sessile; blades linear , 50-100(-130) × 1-4(-15) mm, ± connate , margins entire or spinulose-serrulate. Heads 10-150+, in clusters in corymbiform-paniculiform arrays. Calyculi of 1-3 linear bractlets 1-2.5 mm. Involucres oblong-angular, 3.3-4.5 mm . Phyllaries 5(-6), linear or oblong . Ray florets 0 or 1; laminae yellow, oval to obovate-spatulate, 2-3 mm. Disc florets (2-) 5-7(-8) ; corolla tubes 0.8-1.2 mm, throats basally tubular , becoming funnelform-campanulate apically, 1-1.5 mm. Cypselae linear, 1.2-1.8 mm; pappi 0. 2n = 36. [source]

Flaveria linearis is variable; it typically has linear leaves, calyculi of relatively short, linear bractlets, and oblong-angular involucres. The heads are relatively small with 5-8 florets , and throats of the disc corollas are tubular at the base , abruptly expanding distally to become funnelform-campanulate. Plants of this species, the most common Flaveria in Florida, occur throughout most of the Florida peninsula, often near the coast. [source]

Habit: Subshrub , Shrub , Forb/herb

Flowers: Bloom Period: January, February, March, April, May, June, July, August, September, October, November, December. • Flower Color: yellow

Size/Age/Growth

Size: 24-36" tall.

Habitat

Disturbed sites, beaches, hammocks , pinelands; 0-10(-20+) m (Ref. 100563).

Typically found in the intertidal zone at the water's edge at a mean distance from sea level of -154 meters (-504 feet).[2]

Biome: Coastal.

Biology

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Reproduction

Duration: Perennial

Growth

Culture: Space 15-18" apart.

Soil: Minimum pH: 5.6 • Maximum pH: 8.5

Sunlight: Sun Exposure: Sun to Partial Shade.

Temperature: Cold Hardiness: 9a, 9b, 10a, 10b, 11. (map)

Taxonomy

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Synonyms

Flaveria ×latifolia (J. R. Johnston) R. W. long & E. L. Rhamstine • Flaveria latifolia (J. R. Johnston) Long & Rhamstine

Notes

Name Status: Accepted Name .

Comment: Data Providers: CONABIO, Caribbean Checklist , Govaerts World Compositae Checklist A-G, IPNI, MesoAmericana, Tropicos. GCC LSID: urn :lsid:compositae.org:names:51370DCA-3DDD-4CF4-AFBC-DFF2A51256A7

Last scrutiny: 13-Aug-09

Similar Species

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Members of the genus Flaveria

ZipcodeZoo has pages for 9 species, subspecies, varieties, forms, and cultivars in this genus:

F. bidentis (Coastal-Plain Flaveria) · F. brownii (Brown's Flaveria) · F. campestris (Alkali Yellowtops) · F. chlorifolia (Clasping Flaveria) · F. floridana (Florida Flaveria) · F. haumanii (Spinyface Soldier) · F. linearis (Narrowleaf Yellowtops) · F. macdougalii (Grand Canyon Flaveria) · F. trinervia (Clustered Flaveria)

More Info

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Further Reading

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Notes

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Contributors

Data Sources

Accessed through GBIF Data Portal December 10, 2007:

Identifiers

Footnotes

  1. Sharon C. Yarborough, A. Michael Powell "Flaveria". in Flora of North America Vol. 21 Page 245, 247, 248, 249, 250. Oxford University Press. Online at EFloras.org. [back]
  2. Standard Deviation = 391.390 based on 43 observations. Terrestrial altitude and ocean depth information for each observation from British Oceanographic Data Centre. [back]
Last Revised: 7/15/2012