Cerastium velutinum var. villossissimum

(Pennell) J. K. Morton

Sida 21: 887. 2004.

Common names: Octoraro Creek chickweed
Basionym: Cerastium arvense var. villosissimum Pennell Bartonia 12: 11. 1931
Treatment appears in FNA Volume 5. Treatment on page 92. Mentioned on page 80, 91.

Decumbent sterile shoots well developed, 5–15 (–20) cm. Leaves marcescent, overlapping and obscuring stem; blade broadly lanceolate to ovate, densely villous. 2n = 72.


Phenology: Flowering spring.
Habitat: Serpentine outcrops and barrens
Elevation: 100-300 m

Discussion

Variety villosissimum grows in coarse grass in seepage areas on the serpentine slopes above Octoraro Creek at Lees Bridge, Chester County, Pennsylvania. Plants of var. velutinum with normal pubescence and leaf width grow nearby on the serpentine outcrops. The pubescence, leaf, and habit characters of var. villosissimum are controlled genetically (D. J. Gustafson et al. 2003) and segregation occurs in plants grown from seeds collected at Lees Bridge. These characters are displayed in varying degrees in plants growing on the serpentien barrens and outcrops in surrounding areas of Maryland, New Jersey, and Pennsylvania.

Variety villosissimum is in the Center for Plant Conservation’s National Collection of Endangered Plants.

Lower Taxa

None.

"-2.3timesaslongassepals" is not declared as a valid unit of measurement for this property."timesaslongassepals" is not declared as a valid unit of measurement for this property.

perigynous +  and hypogynous +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
glandular-pubescent +, villose +, subglabrous +  and ciliate-pubescent +
2-fid;acute;obtuse;obtuse +
John K. Morton +
(Pennell) J. K. Morton +
Cerastium arvense var. villosissimum +
elliptic to broadly ovate +  and linear +
2 cm20 mm <br />0.02 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
broadly lanceolate +  and ovate +
not succulent +
0.3 cm3 mm <br />0.003 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
often +  and herbaceous +
lanceolate +
reduced +
herbaceous +  and scarious +
1 cm10 mm <br />0.01 m <br /> (?) +  and 1.4 cm14 mm <br />0.014 m <br /> (?) +
8 +  and 6 +
cylindric +
0.3 cm3 mm <br />0.003 m <br /> (?) +  and 0.4 cm4 mm <br />0.004 m <br /> (?) +
Octoraro Creek chickweed +
5-20-flowered +
not viscid +
dish--shaped +
expanded +
glandular-pubescent +
Md. +, N.J. +  and Pa. +
100-300 m +
straight +  and curved +
central +  and peripheral +
pistillate +  and subsessile +
inconspicuous +
unisexual +  and bisexual +
stalked +  and simple +
Serpentine outcrops and barrens +
straight +
disc--shaped +  and dish +
overlapping +
marcescent +
connate +
translucent +  and purplish +
swollen +
5 cm50 mm <br />0.05 m <br /> (15 cm150 mm <br />0.15 m <br />) +
3 +  and 5 +
crassinucellate +  and bitegmic +
campylotropous +
reflexed;erect +
1 cm10 mm <br />0.01 m <br /> (2.4 cm24 mm <br />0.024 m <br />) +
perigynous +  and hypogynous +
fugacious +
2 times as long as sepals +
obovate +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Flowering spring. +
gustafson2003a +
0.8mm;1.2mm +
tuberculate +
compressed +  and angular-obovate +
lanceolate-elliptic +
persistent +
distinct +
elliptic;ovate +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
15 cm150 mm <br />0.15 m <br /> (20 cm200 mm <br />0.2 m <br />) +
softly pubescent +  and subglabrous +
branched +  and simple +
ascending;erect or decumbent +
subterminal +
[30 +  and 5 +
roughened +  and papillate +
distinct +
clavate +  and filiform +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
rooting +  and rhizomatous +
Cerastium velutinum var. villossissimum +
Cerastium velutinum +
variety +
not inflated +
divided +
10 +  and 8 +
rhizomatous +  and taprooted +
pubescence of simple hairs or stalked glands +  and glabrous +
19 +, 18 +, 17 +, 15] +, 13 +  and [9 +