Difference between revisions of "Marshallia"
Gen. Pl. 2: 810. 1791.
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|publication year=1791 | |publication year=1791 | ||
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|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Marshalliinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Marshalliinae |
Latest revision as of 20:08, 5 November 2020
Perennials, (10–)20–80(–120) cm (fibrous-rooted, usually with caudices, sometimes rhizomatous). Stems erect, sometimes branched (striate). Leaves basal and/or cauline; alternate; petiolate or sessile; blades (1- or 3-nerved) elliptic, linear, linear-elliptic, linear-oblanceolate, oblanceolate, ovate, or spatulate, margins entire, faces glabrous. Heads discoid, borne singly or in open, corymbiform arrays (peduncles relatively long). Involucres hemispheric to obconic, 10–25+ mm diam. Phyllaries persistent, 12–24 in ± 2 series (lanceolate, linear, oblong, ovate, or rhombic, subequal, herbaceous, midnerves often keeled, proximal margins often scarious). Receptacles conic or convex (usually hollow), paleate (paleae linear to spatulate, distally herbaceous). Ray florets 0. Disc florets (20–)45–90(–160+), bisexual, fertile; corollas pale lavender, pink, or purple, or white, (usually hairy) tubes longer than to nearly equaling throats, lobes 5, lance-linear to linear-oblong (often contorted). Cypselae turbinate or clavate (5-angled, ribs 10, often hairy); pappi persistent, of 5(–6) scarious to membranous (hyaline, sometimes scaberulous) scales. x = 9.
Distribution
s, c, se United States.
Discussion
Species 7 (7 in the flora).
Selected References
Lower Taxa
Key
1 | Leaves lance-elliptic, lance-linear, linear, or oblanceolate (lengths mostly 13–30 times widths), widths mostly 2–13 mm | > 2 |
1 | Leaves elliptic, lanceolate, oblanceolate, ovate, or spatulate (lengths mostly 3–13 widths), widths 8–33 mm | > 4 |
2 | Corollas usually pale lavender to purple, rarely white; flowering Aug–Sep | Marshallia graminifolia |
2 | Corollas usually white, sometimes pale lavender; flowering May–Jun | > 3 |
3 | Heads 4–10, 10–25 mm diam | Marshallia ramosa |
3 | Heads borne singly, 20–32 mm diam | Marshallia caespitosa |
4 | Leaves mostly cauline, blades ovate | Marshallia trinervia |
4 | Leaves mostly basal, blades elliptic, lanceolate, oblanceolate, or spatulate | > 5 |
5 | Phyllary apices obtuse; corollas white | Marshallia obovata |
5 | Phyllary apices acute; corollas pink | > 6 |
6 | Heads 1(–2), 26–45 mm diam | Marshallia grandiflora |
6 | Heads 2–5(–10), 22–37 mm diam | Marshallia mohrii |