Difference between revisions of "Holozonia"

Greene

Bull Torrey Bot. Club 9: 122. 1882.

Etymology: Greek holos, whole or entire, and zona, belt or girdle alluding to each phyllary fully (or mostly) investing a ray ovary (cypsela), in contrast to the half-invested cypselae of Hemizonia
Treatment appears in FNA Volume 21. Treatment on page 294. Mentioned on page 255.
FNA>Volume Importer
FNA>Volume Importer
Line 24: Line 24:
 
--><p><i>Holozonia</i> has been treated as congeneric with <i>Hemizonia</i> and with <i>Lagophylla</i>. Like <i>Lagophylla</i>, <i>Holozonia</i> has functionally staminate disc florets, cup-shaped glands, and obcompressed cypselae, each completely or mostly invested by a phyllary. Additional morphologic considerations and biosystematic studies led W. C. Thompson (1983) to reject the hypothesis of a close relationship between <i>Holozonia</i> and <i>Lagophylla</i>. Molecular phylogenetic data are in keeping with a closer relationship of <i>Holozonia</i> to other continental tarweeds with white corollas and x = 14 (i.e., <i>Blepharizonia</i> and <i>Hemizonia</i>), than to <i>Lagophylla</i> (S. Carlquist et al. 2003).</p>
 
--><p><i>Holozonia</i> has been treated as congeneric with <i>Hemizonia</i> and with <i>Lagophylla</i>. Like <i>Lagophylla</i>, <i>Holozonia</i> has functionally staminate disc florets, cup-shaped glands, and obcompressed cypselae, each completely or mostly invested by a phyllary. Additional morphologic considerations and biosystematic studies led W. C. Thompson (1983) to reject the hypothesis of a close relationship between <i>Holozonia</i> and <i>Lagophylla</i>. Molecular phylogenetic data are in keeping with a closer relationship of <i>Holozonia</i> to other continental tarweeds with white corollas and x = 14 (i.e., <i>Blepharizonia</i> and <i>Hemizonia</i>), than to <i>Lagophylla</i> (S. Carlquist et al. 2003).</p>
 
|tables=
 
|tables=
|references=
+
|references={{Treatment/Reference
 +
|id=thompson1983a
 +
|text=Thompson, W. C. 1983. A Biosystematic Study of Lagophylla (Compositae: Heliantheae) and Related Taxa. Ph.D. dissertation. University of California, Davis.
 +
}}
 
}}<!--
 
}}<!--
  
Line 39: Line 42:
 
|family=Asteraceae
 
|family=Asteraceae
 
|distribution=Calif.
 
|distribution=Calif.
|reference=None
+
|reference=thompson1983a
 
|publication title=Bull Torrey Bot. Club
 
|publication title=Bull Torrey Bot. Club
 
|publication year=1882
 
|publication year=1882
 
|special status=
 
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/eaa6e58056e40c9ef614d8f47aea294977a1a5e9/coarse_grained_fna_xml/V19-20-21/V21_721.xml
+
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V19-20-21/V21_721.xml
 
|tribe=Asteraceae tribe Heliantheae
 
|tribe=Asteraceae tribe Heliantheae
 
|subtribe=Asteraceae (tribe Heliantheae) subtribe Madiinae
 
|subtribe=Asteraceae (tribe Heliantheae) subtribe Madiinae

Revision as of 20:39, 16 December 2019

Perennials, 30–150 cm (rhizomatous). Stems (aerial) ± erect. Leaves mostly cauline; proximal opposite (basally connate), distal alternate; sessile; blades lanceolate to linear, margins entire, faces hirsute and (distal leaves) glandular-hirtellous (glands cup-shaped). Heads radiate, borne singly or in loose, corymbiform arrays (peduncles filiform). Peduncular bracts: pit-glands, tack-glands, and/or spines 0. Involucres ± obconic or turbinate, 2–4+ mm diam. Receptacles flat to convex, glabrous or setulose, paleate (paleae falling, in 1 series between rays and discs, connate). Phyllaries 4–10 in 1 series (each mostly or wholly enveloping a ray ovary, ± lance-linear, herbaceous, abaxially hirsute, sometimes glandular-hirtellous, glands cup-shaped). Ray florets 4–10, pistillate, fertile; corollas whitish (abaxially purplish-veined). Disc florets 9–28, functionally staminate; corollas white (pubescent), tubes shorter than funnelform throats, lobes 5, deltate (anthers ± dark purple; styles glabrous proximal to branches). Cypselae (black) obcompressed, ± clavate (basal attachments centered, apices beakless, areolae broadly cupulate, faces glabrous); pappi (rays) 0 or coroniform (0.1–0.3 mm), or (discs) 0 or (readily falling) of 1–5 subulate scales. x = 14.

Discussion

Species 1.

Holozonia has been treated as congeneric with Hemizonia and with Lagophylla. Like Lagophylla, Holozonia has functionally staminate disc florets, cup-shaped glands, and obcompressed cypselae, each completely or mostly invested by a phyllary. Additional morphologic considerations and biosystematic studies led W. C. Thompson (1983) to reject the hypothesis of a close relationship between Holozonia and Lagophylla. Molecular phylogenetic data are in keeping with a closer relationship of Holozonia to other continental tarweeds with white corollas and x = 14 (i.e., Blepharizonia and Hemizonia), than to Lagophylla (S. Carlquist et al. 2003).

Lower Taxa

... more about "Holozonia"
Bruce G. Baldwin +  and John L. Strother +
Greene +
Greek holos, whole or entire, and zona, belt or girdle +  and alluding to each phyllary fully (or mostly) investing a ray ovary (cypsela), in contrast to the half-invested cypselae of Hemizonia +
Bull Torrey Bot. Club +
thompson1983a +
Compositae +
Holozonia +
Asteraceae (tribe Heliantheae) subtribe Madiinae +