Sessileflower false goldenaster (Heterotheca sessiliflora)

Sessileflower false goldenaster
(Heterotheca sessiliflora)
Si n ón i mos: Chrysopsis sessiliflora
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National distribution 1
United States
Ori gi n : Unknown/Undetermined
R egu l ari ty : Regularly occurring
Cu rren tl y : Unknown/Undetermined
Con fi d en ce : Confident
Description 2,3
Peren n i al s, (10–)20–70(–110) cm; taprooted. Stems 1–40+, decumbent to ascending or erect
(sometimes ± brittle, sometimes reddish brown), moderately to densely hispido-strigose (long-spreading
hairs often broken off), sometimes moderately hairy and densely stipitate-glandular distally (axillary leaf
fascicles sometimes present). Leaves: margins flat to strongly undulate; basal and proximal usually
withering by flowering; proximal cauline subsessile, blades oblanceolate, (8–)15–40(–60) × (2.4–)4–8(–11)
mm, bases cuneate, margins entire, strigoso-ciliate (proximal hairs longer, spreading), apices acute,
faces moderately to densely hispido-strigose; distal sessile, blades usually narrowly to broadly
lanceolate, sometimes oblanceolate, 6.5–40 × 1.5–8 mm, usually reduced distally, bases rounded, faces
sparsely to densely hispido-strigose or short-strigose (5–245 hairs/mm 2 ), sparsely to densely glandular
(0–50 glands/mm 2 ). Head s (1–)17–36(–126) in corymbiform or paniculiform arrays, branches ascending.
Ped u n cl es 2–100 mm, densely hispid, strigose, or glandular; bracts 2–5+, proximal lanceolate, leaflike,
distal reduced, phyllary-like, (2–)2.5–8.5(–13) × (0.3–)0.5–1.8(–4) mm, sometimes a few, large, leafy bracts
proximal to heads. In vol u cres cylindric, turbinate, or campanulate (campanulate upon drying), (6–)7.5–
11(–15) mm. Ph yl l ari es in 4–6 series, mid narrowly triangular, unequal (outer lengths 1 / 5 – 1 / 4 inner),
margins hyaline, fimbriate-ciliate apically, faces very sparsely to moderately strigose, very sparsely to
moderately stipitate-glandular. R ay fl orets (4–)7–15(–24); laminae (3.5–)4.5–10.5(–18.5) × (0.7–)1–1.7(–
2.4) mm. Di sc fl orets (9–)20–50(–81); corollas ± ampliate, (4–)5.5–7(–9.5) mm, glabrous to glabrate, lobes
0.4–1 mm, sparsely pilose (hairs 0.1–1 mm, osteolate-celled ones often fragile). Cyp sel ae monomorphic,
obconic, compressed, (1.3–)2–3(–4.5) mm, ribs 6–10, faces sparsely to moderately strigose; p ap p i offwhite, outer of linear scales 0.25–0.5 mm, inner of 25–45 bristles 5–8(–10) mm, longest attenuate to
weakly clavate. 2 n = 18, 36.
Synonym 2,3
Chrysopsis sessiliflora Nuttall, Trans. Amer. Philos. Soc., n. s. 7: 317. 1840; C. villosa (Pursh) Nuttall ex de
Candolle var. sessiliflora (Nuttall) A. Gray
National nature serve conservation status 1
United States
R ou n d ed N ati on al Statu s R an k : NNR - Unranked
Comments 2,3
Except for Heterotheca monarchensis, H. sessiliflora is the only species in the section with long (more
than 0.25 mm), fragile, osteolate-celled hairs on the corolla lobes, and it is the only species native to the
central and southern coastal ranges and valleys of California. The species is divided into four
subspecies and five varieties differentiated on the basis of indument features, degree of waviness of
the leaf margins, and to a lesser extent, stem height and leaf shape. The treatment here is based on J.
C. Semple (1996), which includes a key to and descriptions, illustrations, and distribution maps of the
varieties.
References
1. © NatureServe, some rights reserved
2. Flora of North America Vol. 20: 231, 232, 237, 238, 239, 249 in eFloras.org, Missouri Botanical
Garden. Accessed Nov 12, 2008.
3. © Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA, some rights
reserved