Pectis ×floridana

D. J. Keil

Sida 11: 389. 1986.

Treatment appears in FNA Volume 21. Treatment on page 226. Mentioned on page 224.

Annuals, 5–30 cm; herbage spicy-scented. Stems decumbent to erect, glabrous. Leaves linear, 15–35 × 1–2 mm, margins with 3–5 pairs of setae, faces glabrous (abaxial densely dotted with round oil-glands ca. 0.2 mm). Heads borne singly or in condensed, cymiform arrays. Peduncles 5–25 mm. Involucres cylindric to narrowly fusiform. Phyllaries coherent (falling together), linear or linear-oblanceolate, 5–7 × 1–2 mm (dotted with scattered, oval oil-glands 0.2–0.3 mm). Ray-florets 5; corollas 3.5–4.2 mm. Disc-florets 4–6; corollas 2.2–2.5 mm (2-lipped). Cypselae 3–3.5 mm (pericarps darkening, not swelling, ovules abortive), strigillose to short-pilose; pappi of 2 (ray) or 5 (disc) slender, antrorsely scabrid, aristate scales 2–2.5 mm, sometimes with additional shorter scales or bristles. 2n = 3x = 36.


Phenology: Flowering Sep–Dec.
Habitat: Roadsides
Elevation: 0–50 m

Discussion

Pectis ×floridana is a triploid hybrid between P. glaucescens (2n = 48) and P. prostrata (2n = 24). The hybrids have been observed where the parental taxa grow together in roadside habitats in southern Florida. At the type locality, the hybrids were nearly as common as the parentals. Meiosis in the hybrids is very irregular; resulting pollen grains are malformed and variable in size and apparently all sterile. No fruits have been observed. Regeneration of the hybrids from season to season apparently requires new hybridization events.

The hybrids superficially resemble Pectis linearifolia from which they differ in having spicy-scented rather than lemon-scented herbage, longer peduncles, and strongly carinate phyllaries that cohere at the bases and fall together as a group.

Selected References

None.

Lower Taxa

None.
... more about "Pectis ×floridana"
not tailed +, rounded +  and obtuse +
darkened +  and pale +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
cymiform +  and condensed +
indeterminate +  and determinate +
David J. Keil +
D. J. Keil +
decurrent +
compound +  and simple +
obovate;oblong;obovate;oblong;oblanceolate;linear to elliptic +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
yellow +  and reddened +
0.22 cm2.2 mm <br />0.0022 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
strigillose +  and short-pilose +
cylindric +  and narrowly clavate ribbed or angled +
fertile +  and bisexual +
0–50 m +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Roadsides +
cymiform +, corymbiform +, discoid +  and radiate +
in condensed , cymiform arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
spicy-scented +
each +  and sessile +
0.2 cm2 mm <br />0.002 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
cylindric;narrowly fusiform +
1.5 cm15 mm <br />0.015 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
deltate +  and lanceovate +
dentate to pinnatifid or palmatifid +  and entire +
2-carpellate +
persistent +
coroniform +
0.5 cm5 mm <br />0.005 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
Flowering Sep–Dec. +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
3 +  and 15 +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
bearing subulate enations +, hairy +  and bristly +
pitted +  and smooth +
flat;hemispheric +
aristate +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
exalbuminous +
branched +  and simple to much +
decumbent +  and erect +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Tageteae +
Pectis ×floridana +
species +
cylindric +
toothed +  and entire +
5 cm50 mm <br />0.05 m <br /> (30 cm300 mm <br />0.3 m <br />) +
50 cm500 mm <br />0.5 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
shrub +  and subshrub +