Krigia cespitosa var. gracilis

(de Candolle) K. L. Chambers

Sida 21: 227. 2004.

Common names: Texas dwarfdandelion
Endemic
Basionym: Apogon gracilis de Candolle in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 7: 79. 1838
Synonyms: Krigia gracilis (de Candolle) Shinners
Treatment appears in FNA Volume 19. Treatment on page 367.

Involucres 4.5–7 mm in flower, 5.5–8.5 mm in fruit. Ligules 6.5–11 mm. 2n = 8.


Phenology: Flowering Apr–Jul.
Habitat: Moist clay and sandy soils, pastures, fields, roadsides, and borders of oak-hickory-pine woods and oak savanna, sometimes in disturbed areas
Elevation: 50–300 m

Discussion

Variety gracilis is known principally from tallgrass prairie and mixedgrass prairie biomes. It was formerly recognized as a species. It was reduced to the rank of forma by K. J. Kim and B. L. Turner (1992), who could find no molecular differences between it and forma cespitosa in their cpDNA and rDNA studies (Kim and T. J. Mabry 1991; Kim et al. 1992b, 1992c). The cypsela morphology and chromosome number are identical; the difference in size of the heads and floral parts is well marked, even in areas of sympatry, except for evidently hybrid plants of intermediate morphology.

Selected References

None.

Lower Taxa

None.

"fine" is not a number."broadest" is not a number.

reduced +
scarious +
ovate +  and lanceolate +
paniculiform +  and corymbiform +
indeterminate +  and determinate +
Kenton L. Chambers +  and Robert J. O’Kennon +
(de Candolle) K. L. Chambers +
decurrent +
Apogon gracilis +
compound +  and simple +
oblanceolate;linear +
reduced +
2 cm20 mm <br />0.02 m <br /> (15 cm150 mm <br />0.15 m <br />) +
tuberculate +, rugose +, muricate +  and smooth +
filiform +
sessile +  and petiolate +
Texas dwarfdandelion +
zygomorphic +, actinomorphic +  and (3-)5-merous +
0.2 cm2 mm <br />0.002 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
reddish-brown +  and brown +
La. +, Okla. +  and Tex. +
50–300 m +
glandular-villous +  and glabrous +
winged +  and beaked +
dispersed +
Moist clay and sandy soils, pastures, fields, roadsides, and borders of oak-hickory-pine woods and oak savanna, sometimes in disturbed areas +
indeterminate +
each +  and sessile +
0.2 cm2 mm <br />0.002 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
turbinate;campanulate +
0.55 cm5.5 mm <br />0.0055 m <br /> (0.85 cm8.5 mm <br />0.0085 m <br />) +
cauline +  and basal +
0.65 cm6.5 mm <br />0.0065 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
rounded +  and acute +
dentate +  and entire +
lobed +, toothed +  and entire +
not prominent +  and evident +
2-carpellate +
persistent +
Flowering Apr–Jul. +
connate +  and distinct +
5 +  and 10 +
subequal +  and unequal +
low-convex;flat +
10 +  and 20 +
brownish;yellowish +
exalbuminous +
leafy +, branching +, eglandular +  and branched +
ascending +  and erect +
1 +  and 50 +
scapiform +
appendaged +  and truncate +
papillate +
Krigia gracilis +
Krigia cespitosa var. gracilis +
Krigia cespitosa +
variety +
globose +
4 cm40 mm <br />0.04 m <br /> (42 cm420 mm <br />0.42 m <br />) +
shrub +  and subshrub +
9] +, [6 +  and 5 +