Paysonia

O’Kane & Al-Shehbaz

Novon 12: 380. 2002.

Etymology: For Edwin Blake Payson, 1893–1927, American botanist and first monographer of Lesquerella
Treatment appears in FNA Volume 7. Treatment on page 611. Mentioned on page 224, 236, 240, 604, 612, 617.
 TaxonIllustrator 
FNA7 P77 Nerisyrenia linearifolia.jpegPaysonia lasiocarpa
Paysonia lasiocarpa subsp. lasiocarpa
Paysonia lescurii
Paysonia perforata
Nerisyrenia linearifolia
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey

Annuals or, rarely, biennials or perennials; not scapose; pubescent or glabrous, trichomes short-stalked, forked or subdendritic, often mixed with coarse, simple ones. Stems erect, ascending, decumbent, or procumbent, unbranched or branched. Leaves basal and cauline; petiolate or sessile; basal rosulate, petiolate, blade margins entire, dentate, or pinnately lobed; cauline sessile, blade (base usually auriculate or sagittate, sometimes amplexicaul), margins dentate to lobed. Racemes (several-flowered), often strongly elongated in fruit, (rachis straight). Fruiting pedicels ascending to divaricate or recurved, (straight or slightly curved), slender. Flowers: sepals (deciduous), suberect, ascending, or spreading, oblong, (equal), lateral pair not saccate basally, (margins membranous); petals yellow or white, broadly obovate, claw slightly differentiated from blade, (apex rounded, truncate, retuse, or emarginate); stamens (erect), tetradynamous; filaments dilated or not basally; anthers oblong or sagittate, (not apiculate); nectar glands confluent, subtending bases of median stamens, surrounding lateral stamens. Fruits silicles, subsessile or sessile, globose, subglobose, subpyriform, suborbicular, orbicular, elliptic, cordate, or obovoid, terete, flattened, latiseptate, or angustiseptate; valves (papery or leathery), not veined, glabrous or pubescent, (trichomes branched and/or simple); replum not flattened; septum complete, perforated, or reduced to a rim, (membranous); ovules 4–40 per ovary; style distinct, (persistent, slender); stigma capitate, entire. Seeds sub-biseriate, flattened, margined, orbicular, suborbicular, or oval; cotyledons accumbent. x = 7, 8, 9.

Distribution

sc, se United States, n Mexico

Discussion

Species 8 (8 in the flora).

Paysonia was segregated from Lesquerella (now Physaria) based on its different base chromosome number, presence of auriculate stem leaves, typically annual duration, trichomes that are neither stellate nor tuberculate, and phylogenetic analysis of DNA sequences. Some species of the genus have very limited distributions and are of conservation concern. Five (P. densipila, P. lescurii, P. lyrata, P. perforata, and P. stonensis) are known to be interfertile under experimental conditions, and some combinations form fertile hybrids in the field (R. C. Rollins 1988).

Key

1 Fruits orbicular, elliptic, or cordate > 2
1 Fruits globose, subglobose, subpyriform, or obovoid > 3
2 Fruits angustiseptate; fruiting pedicels recurved; cauline leaf blades: base cuneate to auriculate, not amplexicaul; filaments not dilated basally. Paysonia lasiocarpa
2 Fruits latiseptate; fruiting pedicels divaricate or nearly straight; cauline leaf blades: base auriculate to sagittate, sometimes amplexicaul; filaments dilated basally. Paysonia lescurii
3 Petals white or pale lavender; septums perforate or nearly absent > 4
3 Petals yellow; septums complete > 5
4 Fruits subpyriform, valves sparsely hirsute or glabrate; styles glabrous. Paysonia perforata
4 Fruits subglobose, valves densely hirsute; styles hirsute, at least proximally. Paysonia stonensis
5 Fruit valves pubescent; styles glabrous or pubescent proximally. Paysonia densipila
5 Fruit valves and styles glabrous > 6
6 Fruits 3-4 mm; ovules 4-8 per ovary; septums opaque. Paysonia lyrata
6 Fruits 4-6(-8) mm; ovules (8-)12-28(-40) per ovary; septums translucent > 7
7 Stems hirsute proximally, trichomes simple; petals 4-5 mm wide. Paysonia auriculata
7 Stems pubescent proximally, trichomes branched; petals 6-9 mm wide. Paysonia grandiflora

"elongated" is not a number."thick" is not a number.

... more about "Paysonia"
sagittate +  and oblong +
Steve L. O’Kane Jr. +
O’Kane & Al-Shehbaz +
appendaged +  and unappendaged +
lobed +  and dentate +
much smaller +  and reduced +
urceolate +, campanulate +  and tubular +
branched +  and simple +
well-developed +
distinct +
differentiated +
emarginate +  and entire +
sc +, se United States +  and n Mexico +
straight +  and curved +
For Edwin Blake Payson, 1893–1927, American botanist and first monographer of Lesquerella +
not winged +  and unappendaged +
connate +  and distinct +
not basally +  and dilated +
tetradynamous +
spreading +, ascending +  and suberect +
2-valved +  and capsular +
latiseptate +, sessile +  and subsessile +
angustiseptate +, flattened +, terete +, obovoid +, cordate +, elliptic +, orbicular +, suborbicular +, subpyriform +, subglobose +  and globose +
latiseptate +  and unsegmented +
angustiseptate +  and terete +
sessile +  and petiolate +
alternate +, not +  and rosulate +
cauline +  and basal +
connate +  and distinct +
decurrent +
dentate;lobed +
tenuinucellate +, crassinucellate +  and bitegmic +
campylotropous +  and anatropous +
white +  and yellow +
rudimentary +
obovate +
trinucleate +  and 3(-11)-colpate +
recurved +  and ascending +
slender +
rollins1955a +  and rollins1973a +
not flattened +
sub-biseriate +
not +  and mucilaginous +
white +, black +, brown +  and yellow +
oval +, suborbicular +, orbicular +  and flattened +
persistent +  and caducous +
distinct +
reflexed +, ascending +, spreading +  and erect +
perforated +  and complete +
reduced +
latiseptate +, schizocarpic +, samaroid +  and lomentaceous +
indehiscent +  and dehiscent +
angustiseptate +, flat +, angled +, terete +, torulose +, not +, segmented +  and nutletlike +
tetradynamous +
branched +  and unbranched +
procumbent +  and decumbent +
ascending +  and erect +
entire +  and capitate +
2-lobed +  and entire +
subsessile +, sessile +  and petiolate +
persistent +
distinct +
Cruciferae +
Paysonia +
Brassicaceae tribe Physarieae +
subdendritic +  and short-stalked +
pubescent +  and glabrous +
anastomosing +
perennial +, biennial +  and annual +
glabrous +  and pubescent +
perennial +, biennial +  and annual +
aquatics +  and terrestrial +
glabrous +  and pubescent +
9 +, 8 +  and 7 +