Difference between revisions of "Youngia"
Ann. Sci. Nat. (Paris) 23: 88. 1831.
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|distribution=Asia;introduced also in South America;Europe;Africa;Pacific Islands;Australia. | |distribution=Asia;introduced also in South America;Europe;Africa;Pacific Islands;Australia. | ||
| + | |introduced=true | ||
|discussion=<p>Species ca. 30 (1 in the flora).</p><!-- | |discussion=<p>Species ca. 30 (1 in the flora).</p><!-- | ||
| − | --><p>Youngia americana Babcock (based on a specimen from Alaska) has not been used as an accepted name for plants in the flora area; it was treated as a synonym of Crepis nana var. lyratifolia (Turczaninow) Hultén by E. Hultén (1968).</p> | + | --><p><i>Youngia</i> americana Babcock (based on a specimen from Alaska) has not been used as an accepted name for plants in the flora area; it was treated as a synonym of <i>Crepis nana</i> var. lyratifolia (Turczaninow) Hultén by E. Hultén (1968).</p> |
|tables= | |tables= | ||
|references={{Treatment/Reference | |references={{Treatment/Reference | ||
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|family=Asteraceae | |family=Asteraceae | ||
|illustrator=Yevonn Wilson-Ramsey | |illustrator=Yevonn Wilson-Ramsey | ||
| + | |illustration copyright=Flora of North America Association | ||
|distribution=Asia;introduced also in South America;Europe;Africa;Pacific Islands;Australia. | |distribution=Asia;introduced also in South America;Europe;Africa;Pacific Islands;Australia. | ||
|introduced=true | |introduced=true | ||
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|publication year=1831 | |publication year=1831 | ||
|special status= | |special status= | ||
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V19_339.xml |
|tribe=Asteraceae tribe Cichorieae | |tribe=Asteraceae tribe Cichorieae | ||
|genus=Youngia | |genus=Youngia | ||
Latest revision as of 19:51, 5 November 2020
Annuals, biennials [perennials], (10–)20–90+ cm; taprooted. Stems 1–5+, erect (often scapiform), usually branched distally, sometimes throughout, proximally glabrous, puberulent, or tomentose. Leaves all or mostly basal; petiolate (petiole bases often dilated, ± clasping); blades oblong or ovate to oblanceolate, margins usually pinnately lobed (± lyrate), ultimate margins denticulate. Heads (4–150) in corymbiform to paniculiform arrays. Peduncles (filiform) not distally inflated, seldom bracteate. Calyculi of 3–5+, deltate to ovate (membranous) bractlets. Involucres cylindric to campanulate, 2–3+ mm diam. Phyllaries usually 8 in 1–2 series, lanceolate to linear, ± equal (reflexed in fruit), margins ± scarious, apices obtuse to acute. Receptacles flat to convex, ± pitted, glabrous, epaleate. Florets 8–25+; corollas yellow, sometimes abaxially purplish (anther bases with linear, acute auricles). Cypselae ± reddish brown, ± fusiform and compressed [± terete], weakly or not beaked, ribs 11–13, ± spiculate to scabrellous on ribs; pappi (borne on discs at tips of cypselae) persistent (fragile) [falling], of 40–60+, basally coherent [distinct], white [yellowish or grayish], subequal, smooth to barbellulate bristles in ± 1 series. x = 5 or 8.
Distribution
Introduced; Asia, introduced also in South America, Europe, Africa, Pacific Islands, Australia.
Discussion
Species ca. 30 (1 in the flora).
Youngia americana Babcock (based on a specimen from Alaska) has not been used as an accepted name for plants in the flora area; it was treated as a synonym of Crepis nana var. lyratifolia (Turczaninow) Hultén by E. Hultén (1968).