Leavenworthia texana

Mahler

Sida 12: 239, fig. 1. 1987.

EndemicConservation concern
Synonyms: Leavenworthia aurea var. texana (Mahler) Rollins
Treatment appears in FNA Volume 7. Treatment on page 487. Mentioned on page 486.

Stems (when present) 1–2 dm. Basal leaves: petiole 1.5–4 cm; blade 3.5–5 cm, lobes 0–4 on each side, margins shallowly dentate, terminal lobe transversely broadly oblong, 0.6–0.7 cm × 8–11 mm, (distinctly shorter than wide), considerably larger than lateral lobes, margins slightly lobed or shallowly dentate. Fruiting pedicels: solitary flowers 30–70 mm; racemes 20–40 mm. Flowers: sepals widely spreading, oblong-linear, 3.9–4.5 × 1.4–1.8 mm; petals spreading, bright-yellow, narrowly obovate, 7.3–9 × 2–3 mm, claw dark yellow, 2.6–3.3 mm, apex shallowly emarginate, apical notch 0.1–0.3 mm deep; filaments: median 4–4.5 mm, lateral 2.2–2.5 mm; anthers 0.8–1.3 mm. Fruits oblong, 1.5–2.3 cm × 4–5 mm, smooth, latiseptate, (margined); valves thin; ovules 4–14 per ovary; style 1.7–3 mm. Seeds 3–3.5 mm diam.; wing 0.2–0.4 mm wide; embryo straight. 2n = 22.


Phenology: Flowering Mar–Apr.
Habitat: Pastures, seepage areas of rock outcrops
Elevation: 70-150 m

Discussion

Of conservation concern.

Leavenworthia texana is known only from San Augustine County. It is in the Center for Plant Conservation’s National Collection of Endangered Plants.

Rollins reduced Leavenworthia texana to a variety of L. aurea. The differences in petal color, shape and margin of the terminal lobe, and chromosome number clearly support recognition as distinct species.

Selected References

None.

Lower Taxa

None.

"elongated" is not a number."thick" is not a number."dm" is not declared as a valid unit of measurement for this property.

... more about "Leavenworthia texana"
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
Ihsan A. Al-Shehbaz +  and James B. Beck +
Mahler +
not +  and auriculate +
appendaged +  and unappendaged +
lyrate-pinnatifid +  and entire +
dissected +, repand +, sinuate +, crenate +  and dentate +
much smaller +  and reduced +
3.5 cm35 mm <br />0.035 m <br /> (5 cm50 mm <br />0.05 m <br />) +
urceolate +, campanulate +  and tubular +
branched +  and simple +
sessile +  and petiolate +
well-developed +
distinct +
0.26 cm2.6 mm <br />0.0026 m <br /> (0.33 cm3.3 mm <br />0.0033 m <br />) +
differentiated +
emarginate +  and entire +
70-150 m +
not winged +  and unappendaged +
connate +  and distinct +
lateral +  and median +
0.22 cm2.2 mm <br />0.0022 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
actinomorphic +
3 cm30 mm <br />0.03 m <br /> (7 cm70 mm <br />0.07 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (2.3 cm23 mm <br />0.023 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Pastures, seepage areas of rock outcrops +
alternate +, not +  and rosulate +
cauline +  and basal +
connate +  and distinct +
decurrent +
dentate;lobed +
tenuinucellate +, crassinucellate +  and bitegmic +
campylotropous +  and anatropous +
bright-yellow +
7.3mm;9mm +
rudimentary +
obovate +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (4 cm40 mm <br />0.04 m <br />) +
Flowering Mar–Apr. +
trinucleate +  and 3(-11)-colpate +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
mucilaginous +
margined +  and winged +
uniseriate +  and biseriate +
not +  and mucilaginous +
white +, black +, brown +  and yellow +
3mm;3.5mm +
suborbicular +  and flattened +
persistent +  and caducous +
distinct +
oblong-linear +  and oblong +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
reduced +
latiseptate +, stipitate +  and sessile +
terete +, subterete +, torulose +, linear +  and oblong or subglobose +
latiseptate +, stipitate +  and sessile +
terete +, subterete +, torulose +, linear +  and oblong or subglobose +
Endemic +  and Conservation concern +
tetradynamous +
procumbent +  and decumbent +
descending +, ascending +  and erect +
2-lobed +, entire +, conical +  and capitate +
subsessile +, sessile +  and petiolate +
persistent +
distinct +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Leavenworthia aurea var. texana +
Leavenworthia texana +
Leavenworthia +
species +
0.6 cm6 mm <br />0.006 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
considerably larger +
0.8 cm8 mm <br />0.008 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
scale-like +  and forked +
pubescent +  and glabrous +
anastomosing +
rhizomatous +, taprooted +, scapose +  and not +
perennial +, biennial +  and annual +
subshrub +  and herb +
aquatics +  and terrestrial +
glabrous +  and pubescent +
0.2mm;0.4mm +
15 +, 12 +  and 11 +