Heterotheca sessiliflora subsp. sessiliflora

Common names: Beach goldenaster
Treatment appears in FNA Volume 20. Treatment on page 238. Mentioned on page 241, 244.

Stems 1–30, decumbent to ascending-erect, sparsely to moderately hispid, densely stipitate-glandular distally. Cauline leaves sessile, blades lanceolate, 9–16 (–21) × 4–7 mm, reduced distally, bases rounded, margins strongly undulate, proximal large cilia grading into distal, small ones, faces moderately to densely hispido-strigose, sparsely to moderately glandular; distal green, not stiff, faces usually sparsely to moderately, rarely densely hispido-strigose, densely stipitate-glandular. Peduncle bracts 3–6, proximal lanceolate, leafy, sometimes distally reduced and phyllary-like, often 1–3+ larger, leaflike bracts subtending, equaling or surpassing heads. Involucres (7–) 8.4–10.4 (–11) mm. Ray-florets 14–24; laminae 5–9 (–11) mm. Disc-florets: corolla lobes sparsely pilose (hairs 0.15–0.4 mm). Cypsela faces sparsely strigose. 2n = 18.


Phenology: Flowering (Mar–)Jun–Sep+.
Habitat: Coastal dunes, strand, mud flats
Elevation: 0–60 m

Distribution

V20-524-distribution-map.gif

Calif., Mexico (Baja California)

Discussion

The peak blooming period for subsp. sessiliflora is mid to late summer, but rare individuals can produce some heads throughout much of the year (San Diego County to northern Baja California). The type comes from Santa Barbara, where the subspecies now appears to be extinct. The plants vary greatly in habit. Some are sometimes short and herbaceous, the shoots dying back at the end of the growth season. In the northern Baja California coastal dunes are meter-high shrubs, the shoots of which have not been killed back to rootstock level. The shift from densely hairy proximal cauline leaves to densely glandular distal ones occurs abruptly in some shoots and gradually in others. The subspecies has become very rare in California.

Selected References

None.

Lower Taxa

None.

"[" is not declared as a valid unit of measurement for this property."]" is not declared as a valid unit of measurement for this property.

not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
paniculiform +  and corymbiform +
indeterminate +  and determinate +
John C. Semple +
(Nuttall) Shinners +
rounded +
Chrysopsis sessiliflora +
compound +  and simple +
1.6 cm16 mm <br />0.016 m <br /> (2.1 cm21 mm <br />0.021 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
0.9 cm9 mm <br />0.009 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
lanceolate +
reduced +
4mm;7mm +
rugulose +  and muricate +
leafy +  and phyllary-like +
0.85 cm8.5 mm <br />0.0085 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.85 cm8.5 mm <br />0.0085 m <br />) +
subtending +
surpassing heads +  and equaling +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
barbellulate +  and barbellate +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
rhizomatous +  and taprooted +
Beach goldenaster +
not 2-lipped +  and actinomorphic +
0.7 cm7 mm <br />0.007 m <br /> (0.95 cm9.5 mm <br />0.0095 m <br />) +
glabrous +  and glabrate +
ampliate +
0.55 cm5.5 mm <br />0.0055 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
compressed +  and obconic +
fertile +  and bisexual +
Calif. +  and Mexico (Baja California) +
0–60 m +
stipitate-glandular +  and hispido-strigose +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Coastal dunes, strand, mud flats +
paniculiform +
in corymbiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
lanceolate +
reduced +
each +  and sessile +
attenuate +  and weakly clavate +
tan;rusty brown +
attenuate +  and clavate +
1.04 cm10.4 mm <br />0.0104 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
campanulate;turbinate;campanulate;turbinate;cylindric +
0.84 cm8.4 mm <br />0.0084 m <br /> (1.04 cm10.4 mm <br />0.0104 m <br />) +
1.05 cm10.5 mm <br />0.0105 m <br /> (1.85 cm18.5 mm <br />0.0185 m <br />) +
0.9 cm9 mm <br />0.009 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.24 cm2.4 mm <br />0.0024 m <br />) +
4.5mm;10.5mm +
0.5 cm5 mm <br />0.005 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
1mm;1.7mm +
sessile +  and petiolate +
proximal +  and basal +
erect;spreading +
lanceolate +, triangular +  and deltate +
fimbriate-ciliate +  and strigoso-ciliate +
stipitate-glandular +  and strigose +
undulate +
small +
2-carpellate +
in 3 +  and 4 series +
phyllary-like +  and leafy +
larger +  and reduced +
glandular +, strigose +  and hispid +
0.2 cm2 mm <br />0.002 m <br /> (10 cm100 mm <br />0.1 m <br />) +
Flowering (Mar–)Jun–Sep+. +
lanceolate +  and linear-lanceolate +
ovate-oblanceolate +
Field & Lab. +
bearing subulate enations +, hairy +  and bristly +
subulate;convex +
6 +  and 10 +
3 +  and 40 +
linear +  and linear-lanceolate or triangular +
0.025 cm0.25 mm <br />2.5e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
exalbuminous +
Illustrated +
decumbent +  and ascending-erect +
1 +  and 30 +
appendaged +  and truncate +
papillate +  and smooth +
Chrysopsis villosa var. sessiliflora +
Heterotheca sessiliflora subsp. sessiliflora +
Heterotheca sessiliflora +
subspecies +
70 cm700 mm <br />0.7 m <br /> (110 cm1,100 mm <br />1.1 m <br />) +
20 cm200 mm <br />0.2 m <br /> (70 cm700 mm <br />0.7 m <br />) +
tree +, shrub +  and subshrub +