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Acamptopappus shockleyi

(Shockley´s Goldenhead)

Overview

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Vulnerable
Threat status

Common Names

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Common Names in English:

Shockley´s Goldenhead, Shockley's Goldenhead

Description

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Genus Acamptopappus

Shrubs , 20-40 cm (deciduous; taproots woody). Stems erect (older portions gray, usually with shredding bark ), branched, spinescent with age, glabrous or hirtellous. Leaves cauline; alternate (sometimes in axillary fascicles) ; petiolate or sessile; blades (gray-green) 1-nerved, narrowly lanceolate or narrowly obovate or spatulate , margins entire, faces glabrous, scabrous , or scabro-hirtellous, eglandular . Heads radiate or discoid , borne singly or in loose corymbiform arrays (pedunculate ). Involucres campanulate to hemispheric or globose , (4-13 ×) 7-16 mm. Phyllaries 13-25 in 3 series, appressed (reflexing at maturity, bases yellowish, apices green), 1-nerved (flat), broadly ovate to elliptic-ovate, unequal, margins broadly hyaline , lacerate , faces glabrous. Receptacles flat to slightly convex , deeply pitted (pit margins ± lacerate), epaleate. Ray florets usually 5-14, sometimes 0, pistillate , fertile ; corollas yellow. Disc florets 13-45, bisexual , fertile; corollas yellow, tubes longer than funnelform throats , lobes 5, reflexed , lanceolate; style-branch appendages triangular-lanceolate. Cypselae obconic, compressed , nervation not evident, faces densely sericeous to villous (some hairs ascending-spreading, others appressed and tortuous ) ; pappi persistent , of 18-22, variably thick, broadly flattened, subequal , marginally barbellate or barbellulate to smooth , apically attenuate (ray) to spatulate (disc), setiform scales (heights equaling disc corollas) in 1-2 series, plus much shorter bristles or setae. x = 9.

Species 2: sw United States.

Acamptopappus is essentially endemic to the Mojave Desert of California, Arizona, Nevada, and Utah. The genus is recognized as low, white-barked, desert shrubs with pedunculate heads, borne singly or in loose, corymbiform arrays, with ovate phyllaries with broad hyaline margins, 0 or 5-14 yellow rays, sericeous to villous cypselae, and thick pappus scales.[1]

Physical Description

Species Acamptopappus shockleyi

Leaf faces densely, hirtellous. Heads borne singly. Involucres campanulate to hemispheric , 7-10 mm wide. Rays 5-14. 2n = 18. Flowering Apr-Jun. [source]

Habit: Subshrub , Shrub

Habitat

Mesas, ridges , slopes , ravines , washes, in various shrub associations, commonly with Larrea, Yucca, Ambrosia, Artemisia, Ephedra, Atriplex; 500-1700(-2000) m [2].

Biology

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Reproduction

Duration: Perennial

Taxonomy

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Notes

Name Status: Accepted Name . Latest taxonomic scrutiny: 15-Mar-2000

Name verified on

Place of publication : Proc. Amer. Acad. Arts 17:208. 1882

Name verified on 17-May-2007 by ARS Systematic Botanists. Last updated: 28-Aug-2007

Similar Species

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Members of the genus Acamptopappus

ZipcodeZoo has pages for 5 species, subspecies, varieties, forms, and cultivars in this genus:

A. microcephalus · A. shockleyi (Shockley´s Goldenhead) · A. sphaerocephalus (Rayless Goldenhead) · A. sphaerocephalus var. hirtellus (Rayless Goldenhead) · A. sphaerocephalus var. sphaerocephalus (Rayless Goldenhead)

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 February 16, 2008:

Identifiers

Footnotes

  1. Guy L. Nesom "Acamptopappus". in Flora of North America Vol. 20 Page 5, 184, 185. Oxford University Press. Online at EFloras.org. [back]
  2. "Acamptopappus shockleyi". in Flora of North America Vol. 20 Page 185. Oxford University Press. Online at EFloras.org. [back]
Last Revised: 7/1/2009