Trans. Amer. Philos. Soc., n. s.7: 338. 1840
sw United States, nw Mexico.
Species 7 (7 in the flora).
See discussion of Filagininae following the tribal description (p. 385).
Stylocline occurs in Mediterranean, desert, and semi-desert climates; most species appear only after exceptionally wet winters, or in moisture-accumulating microsites (e.g., rock bases, washes, shrub drip-lines). Plants usually grow in undisturbed soils (often with soil crusts) and sometimes colonize stabilized disturbances.
In some species of Stylocline, the outermost bracts of heads are merely concave, not saccate; these are paleae (if they subtend and fall with florets) or phyllaries (if they persist and subtend only adjacent saccate paleae). Texture of the palea bodies is diagnostic for each species. In dried specimens, chartaceous bodies tear easily and irregularly when the abaxial indument is gently scraped. Cartilaginous bodies can be scraped clean without tearing and split lengthwise only if forced.
Stylocline appears to be ancestral to Micropus and Psilocarphus, and derived from, sister to, and/or reticulate with Logfia (J. D. Morefield 1992). Stylocline citroleum, S. sonorensis, and L. depressa show some transitional traits between the genera.
|1||Longest pistillate paleae winged proximally and distally, wings widest in proximal 2/3 of palea lengths; phyllaries ± persistent, elliptic or broader, 1–3.5 mm||> 2|
|1||Longest pistillate paleae winged distally, wings widest in distal 1/3 of palea lengths; phyllaries 0, vestigial, or falling, ± subulate, mostly 0.1–0.5 mm||> 3|
|2||Longest pistillate paleae: wings broadly ovate (bases rounded or cordate); staminate ovaries vestigial, 0–0.2 mm, pappi usually of 1–5 bristles; heads arachnoid to thinly lanuginose (often shiny, indument obscured by palea wings)||Stylocline gnaphaloides|
|2||Longest pistillate paleae: wings elliptic to slightly obovate (bases acute); staminate ovaries partially developed, (0.2–)0.3–0.6 mm, pappi of (5–)6–12(–13) bristles; heads thickly lanuginose (dull, indument evident)||Stylocline citroleum|
|3||Receptacles clavate, heights 2.8–3.5 times diams.; staminate ovaries partially developed, 0.3–0.6 mm (cypselae 0.6–0.8 mm; heads ± spheric, diams. 3–4 mm; longest pistillate paleae 1.9–3.1 mm; proximal leaves blunt)||Stylocline sonorensis|
|3||Receptacles ± cylindric, heights 4–8 times diams.; staminate ovaries ± vestigial, 0–0.3(–0.4) mm (cypselae 0.8–1.6 mm, heads ovoid to ellipsoid or diams. 5–9 mm, longest pistillate paleae 3.4–4.5 mm and/or proximal leaves acute)||> 4|
|4||Heads ± spheric, thickly lanuginose, largest diams. 5–9 mm; pistillate paleae: longest 3.4–4.5 mm, outermost saccate||> 5|
|4||Heads ovoid to ellipsoid, thinly lanuginose, largest diams. 1.5–4 mm; pistillate paleae: longest 2–3.3 mm, outermost open, concave||> 6|
|5||Bodies of longest pistillate paleae (except midnerves) chartaceous; cypselae compressed; largest capitular leaves (some or all) subulate to lanceolate (widest in proximal 1/3), (7–)11–17 mm (distalmost mainly 1.5–2 times head heights)||Stylocline micropoides|
|5||Bodies of longest pistillate paleae cartilaginous; cypselae obcompressed; largest capitular leaves (all) ± elliptic to ± oblanceolate (widest in distal 2/3), 4–11 mm (distalmost mainly 0.8–1.2 times head heights)||Stylocline intertexta|
|6||Heads 2.5–4 mm diam.; longest pistillate paleae 2.8–3.3 mm; cypselae 1.1–1.6 mm; staminate corollas 1.1–1.7 mm (lobes usually 5); leaves ± acute||Stylocline psilocarphoides|
|6||Heads 1.5–2.5 mm diam.; longest pistillate paleae 2–2.7 mm; cypselae 0.7–1 mm; staminate corollas 0.8–1.1 mm (lobes usually 4); leaves blunt||Stylocline masonii|
|Author||James D. Morefield +|
|Common name||Neststraw +|
|Etymology||Greek stylos, column, pillar, or pole, and cline, couch or bed (or gyne, female, specified by Nuttall in protologue), alluding to narrowly cylindric receptacles of the type species +|
|Illustrator||Linny Heagy +|
|Taxon name||Stylocline +|
|Taxon parent||Asteraceae tribe Gnaphalieae +|
|Taxon rank||genus +|
|Volume||Volume 19 +|