Rayjacksonia phyllocephala
Rayjacksonia
camphor daisy, Gulf Coast camphor-daisy
tansyaster
erect to decumbent-ascending, branched basally (leafy throughout).
blades oblong to oblanceolate, mid-cauline (2.5–)4–13 mm wide.
mostly cauline; alternate;
sessile to subpetiolate;
blades 1-nerved (pinnately veined), linear to oblanceolate, margins coarsely serrate (teeth bristle-tipped), rarely entire (apices acute to obtuse).
(6–)10–15 × 12–30 mm.
shallowly convex, pitted, epaleate.
17–38;
corollas 8.5–19 mm.
14–46, pistillate, fertile;
corollas yellow.
corolla tubes longer than limbs.
25–130, bisexual, fertile;
corollas yellow, tubes shorter than abruptly ampliate throats, lobes 5, erect, triangular;
style-branch appendages deltate.
in 3–4 series, loose, subequal, apices erect to spreading, 1.3–1.7 mm wide, herbaceous.
20–40 in 4–5 series, appressed or tips spreading to reflexed, 1-nerved (flat or proximally convex), linear to lanceolate or ovate-lanceolate, equal to subequal, white-indurate, margins of inner scarious (apices erect, loosely spreading, or recurved, green-herbaceous, acute to acuminate), faces glabrous or glandular.
essentially sessile, often surpassed by distal leaves that continue to very base of heads.
radiate, in paniculiform or subcorymbo-cymiform arrays. (Peduncles sometimes cobwebby.) Involucres hemispheric, (7–16 ×) 9–30 mm.
dimorphic, faces strigoso-sericeous;
ray broadly ellipsoid to obovoid, 3-angled (thick-walled), 0–4-ribbed;
disc broadly ellipsoid to clavate, ± radially compressed (thinner-walled), 5–9-ribbed;
pappi persistent, of 30–40 brownish, unequal, barbellate, attenuate bristles in 3–4 series (about as long as disc corollas), outer thinner, terete, inner thick-flattened.
= 6.
= 12.
Rayjacksonia phyllocephala
Rayjacksonia
Species 3 (3 in the flora).
R. L. Hartman (1990) informally recognized the three species of Rayjacksonia as an undescribed genus most closely related to Grindelia, Isocoma, Xanthocephalum, and other genera of Machaerantherinae with x = 6. The taxonomy was formalized by M. A. Lane and Hartman (1996). The Rayjacksonia species are coherent in vestiture, spinulose leaf teeth, heads borne singly, and rays with prominent, yellow laminae.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Mid-cauline leaf blades linear to linear-oblanceolate, 1–3(–4) mm wide; involucres 4–7 × 10–15 mm; rays 14–19, corollas 6.5–9.5 mm | R. aurea |
1. Mid-cauline leaf blades oblanceolate to oblong or oblong-lanceolate, (1–)4–15(–25) mm wide; involucres (4.5–)6–15 × 9–30 mm; rays (13–)17–38, corollas 6–19 mm | → 2 |
2. Heads on short, leafless or bracteate peduncles, not surpassed by distal leaves; mid-cauline leaf blades (1–)4–15(–25) mm wide; phyllaries in 3–4 series, strongly unequal, apices broadly spreading to squarrose, ca. 0.9–1 mm wide | R. annua |
2. Heads essentially sessile, often surpassed by distal leaves that continue to very base of heads; mid-cauline leaf blades (2.5–)4–13 mm wide; phyllaries in 3–4 series, subequal, apices erect to spreading, 1.3–1.7 mm wide | R. phyllocephala |
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