Pennellia tricornuta

(Rollins) R. A. Price

Novon 11: 339. 2001.

Basionym: Arabis tricornuta Rollins J. Wash. Acad. Sci. 29: 478. 1939
Treatment appears in FNA Volume 7. Treatment on page 561. Mentioned on page 560.

Stems simple or few from base, 1.5–9 dm, pubescent proximally, trichomes simple and long-stalked, 2–3-rayed. Basal leaves usually persistent; petiole 0.5–3 cm; blade oblanceolate, 3–9 cm × 3–23 mm, margins dentate, surfaces pubescent, trichomes stalked, 2–4-rayed. Cauline leaves (distal) sessile; blade linear, 2.7–7.5 cm × 1–9 mm, surfaces glabrous or sparsely pubescent. Racemes secund, 2–6 dm in fruit. Fruiting pedicels ascending, arcuate, 7–11 mm. Flowers: sepals purple or green, oblong, 2.3–4 × 0.8–2.1 mm, (subequal); petals lavender apically, spatulate, (2.7–) 3.3–4.5 × (0.5–) 1–1.5 (–1.7) mm, (equal); filaments (1.7–) 2–2.8 (–3.3) mm; anthers 0.9–1 (–1.3) mm. Fruits divaricate-ascending, straight or curved, 3.3–6.5 cm × 2–2.5 mm, latiseptate; valves glabrous; septum opaque; ovules 40–50 per ovary; style obsolete to 0.2 mm. Seeds uniseriate, flattened, winged, oblong, 2.4–2.8 × 1.2–1.9 mm; seed-coat not mucilaginous when wetted; cotyledons accumbent.


Phenology: Flowering Jul–Sep.
Habitat: Steep rocky slopes, under pines, road and sand banks
Elevation: 1300-2800 m

Discussion

Of conservation concern.

Pennellia tricornuta is known from Cochise, Pima, and Santa Cruz counties. It was recognized by R. C. Rollins (1941, 1993) under Arabis, but as shown by Price, Bailey & Al-Shehbaz and by S. Fuentes-Soriano (2004), it clearly belongs to Pennellia.

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 "Pennellia tricornuta"
0.1 cm1 mm <br />0.001 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
ovate +  and oblong +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Sara Fuentes-Soriano +  and Ihsan A. Al-Shehbaz +
(Rollins) R. A. Price +
Arabis tricornuta +
appendaged +  and unappendaged +
not auriculate +
2.7 cm27 mm <br />0.027 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
dentate +  and sinuate or runcinate +
oblanceolate +
much smaller +  and reduced +
0.1 cm1 mm <br />0.001 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
urceolate +, campanulate +  and tubular +
branched +  and simple +
well-developed +
undifferentiated +
not +  and differentiated +
emarginate +  and entire +
1300-2800 m +
straight +  and curved +
not winged +  and unappendaged +
0.28 cm2.8 mm <br />0.0028 m <br /> (0.33 cm3.3 mm <br />0.0033 m <br />) +
connate +  and distinct +
0.2 cm2 mm <br />0.002 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
zygomorphic +  and actinomorphic +
curved +  and straight +
3.3 cm33 mm <br />0.033 m <br /> (6.5 cm65 mm <br />0.065 m <br />) +
divaricate-ascending +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
latiseptate +  and unsegmented +
angustiseptate +  and terete +
latiseptate +, stipitate +  and sessile +
curved +  and straight +
terete +  and not torulose +
Steep rocky slopes, under pines, road and sand banks +
sessile +  and petiolate +
alternate +, not +  and rosulate +
cauline +  and basal +
connate +  and distinct +
decurrent +
lobed;dentate;lobed;dentate +
obscure +  and prominent +
tenuinucellate +, crassinucellate +  and bitegmic +
campylotropous +  and anatropous +
0.27 cm2.7 mm <br />0.0027 m <br /> (0.33 cm3.3 mm <br />0.0033 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
3.3mm;4.5mm +
rudimentary +
spatulate +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Flowering Jul–Sep. +
trinucleate +  and 3(-11)-colpate +
slender +
0.7 cm7 mm <br />0.007 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
mucilaginous +
biseriate +  and uniseriate +
not +  and mucilaginous +
white +, black +, brown +  and yellow +
0.24 cm2.4 mm <br />0.0024 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
oblong +  and flattened +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.19 cm1.9 mm <br />0.0019 m <br />) +
green +  and purple +
persistent +  and caducous +
distinct +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.21 cm2.1 mm <br />0.0021 m <br />) +
reduced +
latiseptate +, schizocarpic +, samaroid +  and lomentaceous +
indehiscent +  and dehiscent +
angustiseptate +, flat +, angled +, terete +, torulose +, not +, segmented +  and nutletlike +
tetradynamous +
procumbent +  and decumbent +
2-lobed +, entire +, conical +  and capitate +
subsessile +, sessile +  and petiolate +
persistent +
distinct +
0 cm0 mm <br />0 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
pubescent +  and glabrous +
Lamprophragma +
Pennellia tricornuta +
Pennellia +
species +
stalked +, long-stalked +  and simple +
coiled +, 1-7-veined +  and veined +
anastomosing +
glabrous +  and pubescent +
rhizomatous +, taprooted +, scapose +  and not +
perennial +, biennial +  and annual +
subshrub +  and herb +
aquatics +  and terrestrial +
glabrous +  and pubescent +