key, “radiate heads” have ray florets; “eradiate heads” lack ray florets and may be disciform, discoid, or radiant. Ray florets have zygomorphic corollas
270 KB (5,940 words) - 20:46, 31 January 2022
from receptacles among florets, e.g., some Gaillardia spp.; sometimes pitted, pit borders often fimbrillate to lacerate). Ray florets (rarely 0) usually in
24 KB (1,707 words) - 21:07, 5 November 2020
either in 1 series interior to ray florets, then usually connate and persistent, or 1 palea subtending each disc floret, then usually distinct and soon
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usually falling, oblong to linear or filiform, flat or ± conduplicate). Ray florets 0 or in 1(–2+) series, usually pistillate and fertile, rarely neuter or
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socket margins often fimbrillate; paleate in Eastwoodia and Rigiopappus). Ray florets 0 or in 1(–2+) series, usually pistillate, rarely neuter or styliferous
74 KB (1,788 words) - 20:57, 5 November 2020
paleate (paleae sometimes enfolding pistillate florets). Ray florets usually 0 (sometimes peripheral florets pistillate and corollas ± zygomorphic and bearing
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(paleae strongly conduplicate, each partly investing its subtended floret). Ray florets 0 or 3–25+, neuter; corollas yellow or orange, brown-purple, maroon
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thinner, each subtending a ray floret). Receptacles flat to slightly convex, paleate (paleae oblong, lanceolate, or linear). Ray florets 8–35+ in 1–4 series,
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investing subtended floret in H. newberryi). Ray florets usually 0, sometimes 8, pistillate, fertile; corollas white or whitish. Disc florets 12–70+, bisexual
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(often pitted and often bristly-setose or densely hairy). Ray florets 0 (corollas of peripheral florets in radiant heads often notably enlarged, usually 5-lobed
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Etymology: Greek tetra, four, and neuron, nerve, alluding to venation of ray floret corollas Treatment appears in FNA Volume 21. Treatment on page 447. Mentioned
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lance-attenuate or oblanceolate, herbaceous, each usually 1/2 enveloping subtended ray floret proximally, abaxially ± hirsute and sessile- or stipitate-glandular).
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lance-attenuate or oblanceolate, herbaceous, each usually 1/2 enveloping subtended ray floret proximally, abaxially scabroso-hirtellous, hirsute, or villous and/or
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sockets sometimes ± membranous). Florets of 1, 2, or 3+ kinds in a head (some not readily assignable to usual ray- and disc-floret categories, ± 3 combinations
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glabrous. Staminate heads 2–53 (ray florets: 0 or 1–70, styliferous and sterile, corolla laminae 1.1–12 mm; disc florets 11–78, functionally staminate;
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lanceolate or oblanceolate, herbaceous, each usually 1/2 enveloping a subtended ray floret proximally, abaxially pubescent to hirsute or villous, and stipitate-glandular)
5 KB (476 words) - 21:14, 5 November 2020
oblanceolate, or obovate, herbaceous, each usually 1/2 enveloping a subtended ray floret proximally, abaxially with pit-gland-tipped processes and glabrous or
5 KB (389 words) - 21:14, 5 November 2020
lance-attenuate or oblanceolate, herbaceous, each 1/2 or fully enveloping subtended ray floret proximally, ciliolate, abaxially stipitate-glandular, sometimes hirtellous)
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subtending a ray floret). Receptacles conic, paleate (paleae persistent, lanceolate to lance-ovate, flat or weakly conduplicate, apices acute). Ray florets 6–21+
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(paleae ± linear-conduplicate, each wrapped round a disc floret, distally dilated, hirtellous). Ray florets (2–)8(–13), pistillate, fertile; corollas pale yellow
8 KB (477 words) - 21:10, 5 November 2020