Difference between revisions of "Heterosperma"

Cavanilles

Icon. 3: 34. 1795.

Etymology: Greek, heteros, differing, and sperma, seed probably alluding to the contrasting outer and inner cypselae
Treatment appears in FNA Volume 21. Treatment on page 218. Mentioned on page 184.
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|family=Asteraceae
 
|family=Asteraceae
 
|illustrator=Linny Heagy
 
|illustrator=Linny Heagy
 +
|illustration copyright=Flora of North America Association
 
|distribution=sw United States;Mexico;Central America;South America;introduced in West Indies.
 
|distribution=sw United States;Mexico;Central America;South America;introduced in West Indies.
 
|reference=None
 
|reference=None
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|publication year=1795
 
|publication year=1795
 
|special status=
 
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V19-20-21/V21_531.xml
+
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V21_531.xml
 
|tribe=Asteraceae tribe Heliantheae
 
|tribe=Asteraceae tribe Heliantheae
 
|subtribe=Asteraceae (tribe Heliantheae) subtribe Coreopsidinae
 
|subtribe=Asteraceae (tribe Heliantheae) subtribe Coreopsidinae

Latest revision as of 20:12, 5 November 2020

Annuals, 10–40(–70+) cm (taprooted). Stems 1 (bases relatively thick), ascending to erect, branched distally or ± throughout (striate). Leaves mostly cauline; opposite; obscurely petiolate or sessile; blades mostly pinnately lobed [undivided] (lobes 3–5, usually linear to filiform, sometimes lanceolate), ultimate margins usually entire, sometimes denticulate (often ciliate, at least proximally, apices acute), faces glabrous [hairy]. Heads radiate, borne singly or in loose, cymiform arrays. Calyculi of (1–)3–5+ erect, narrowly spatulate or linear to filiform, herbaceous bractlets (often surpassing phyllaries, margins usually hispid-ciliate). Involucres cylindric to obconic, 2–5 mm diam. (larger in fruit). Phyllaries 3–5+ in ± 2 series, distinct, erect, mostly oblong or ovate, equal, membranous. Receptacles concave to flat, paleate; paleae similar to phyllaries, oblong or oval to lanceolate or linear (± embracing cypselae, ± hyaline with brown striae, apices obtuse, apiculate). Ray florets 1–3[–8], pistillate, fertile; corollas pale yellow [orange]. Disc florets 3–10[–20+], bisexual, fertile; corollas ± yellow (at least distally), tubes shorter than funnelform throats, lobes 5, deltate. Cypselae (± dimorphic) outer obcompressed, ellipsoid or obovoid, winged (wings ± corky, often cucullate and/or pectinate), faces often corky-tuberculate, glabrous, inner ± obovoid, usually some (innermost) tapered to ± barbellate beaks; pappi 0, or persistent or tardily falling, of (1–)2–3 spreading to reflexed, retrorsely barbellate awns. x = 25.

Distribution

sw United States, Mexico, Central America, South America, introduced in West Indies.

Discussion

Species 5–10 (1 in the flora).

Selected References

None.

... more about "Heterosperma"
Justin W. Allison +
Cavanilles +
sw United States +, Mexico +, Central America +, South America +  and introduced in West Indies. +
Greek, heteros, differing, and sperma, seed +  and probably alluding to the contrasting outer and inner cypselae +
Undefined (tribe Undefined) subtribe Coreopsideae +  and Undefined (tribe Undefined) subtribe Petrobiinae +
Heterosperma +
Asteraceae (tribe Heliantheae) subtribe Coreopsidinae +