Ancistrocarphus keilii

Morefield

Novon 14: 464, fig. 1. 2004.

Common names: Santa Ynez groundstar
Treatment appears in FNA Volume 19. Treatment on page 466. Mentioned on page 465, 470.

Plants 0.5–1 (–2) cm. Stems 0. Leaves basal, petiolate, largest 8–10 (–18) × 1 (–2) mm, some ± grading into pistillate paleae (by reduction or loss of blades and expansion of petiole bases, resembling aristate phyllaries); bases (of petioles) expanded, 3-nerved, yellowish tan, parchmentlike, closely involucral. Heads borne singly amidst surrounding leaves (see discussion below), 2.5–3.5 mm. Phyllaries 0. Receptacles broadly hourglass-shaped, 0.9–1.3 mm. Pistillate paleae: wings obscure, incurved, lanceolate, ± involute. Staminate paleae 5 (–7), broadly spatulate, 1.8–2.8 mm, slightly surpassed by pistillate; apices incurved, ± involute, obtuse to rounded, apiculate, shortly scarious, not spinose. Staminate corollas ± zygomorphic, 0.9–1.3 mm, lobes 4, unequal (1–2 enlarged). Cypselae 1–1.4 × 0.5–0.6 mm, transverse bands 0.


Phenology: Flowering and fruiting Mar–Apr.
Habitat: Sandy soils, chaparral bordering oak woodlands, under shrubs
Elevation: 40–130 m

Discussion

Of conservation concern.

Unlike Ancistrocarphus filagineus, A. keilii has no obvious dispersal mechanism. Its cypselae appear to germinate more or less in place from previous years’ plants, often producing dense, turflike growths of dozens to hundreds of individuals (these sometimes resemble leafy glomerules of heads; each head is on a separate plant with its own root). Lack of dispersal may explain its very limited geographic range in the Santa Ynez River drainage of Santa Barbara County. Its range does not appear to overlap with that of A. filagineus, which is found farther inland to the east and north. No other Filagininae have been found mixed with A. keilii, suggesting that its habitat is fairly distinctive.

Ancistrocarphus keilii is known from only three collections and appears to occur in relatively vulnerable habitats (J. D. Morefield 2004).

Selected References

None.

Lower Taxa

None.
... more about "Ancistrocarphus keilii"
not spinose +  and apiculate +
scarious +
mostly ovate +  and lanceovate or linear +
indeterminate +  and determinate +
James D. Morefield +
Morefield +
yellowish tan +
involucral +
parchmentlike +
expanded +
compound +  and simple +
oblanceolate;obovate +
muriculate +, papillate +  and smooth +
spatulate;lanceolate;less boatshaped;ovoid +
Santa Ynez groundstar +
zygomorphic +  and staminate +
red-tipped +, purplish +, yellow +  and whitish +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
black-banded +  and brown +
0.1 cm1 mm <br />0.001 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
not gibbous +, obovoid +  and obcompressed +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
40–130 m +
staminate +  and pistillate +
winged +  and beaked +
dispersed +
Sandy soils, chaparral bordering oak woodlands, under shrubs +
singly +  and aggregated +
indeterminate +
homogamous +  and heterogamous +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
each +  and sessile +
inconspicuous +
1 cm10 mm <br />0.01 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
8mm;10mm +
largest +
1 cm10 mm <br />0.01 m <br /> (?) +
rarely lanceovate +  and lanceolate +
unequal +
2-carpellate +
staminate +  and pistillate +
persistent +
spreading +, erect +  and ascending +
spatulate +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
persistent +
Flowering and fruiting Mar–Apr. +
subequal +  and unequal +
paleate +  and epaleate +
hourglass--shaped +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
exalbuminous +
erect +, ascending +  and prostrate +
1 +, 2 +  and 10 +
appendaged +  and truncate +
papillate +
Stylocline sect. Ancistrocarphus +
Ancistrocarphus keilii +
Ancistrocarphus +
species +
0.5 cm5 mm <br />0.005 m <br /> (14 cm140 mm <br />0.14 m <br />) +
lanceolate +