Dithyrea

Harvey

London J. Bot. 4: 77, plate 5. 1845.

Common names: Spectacle-pod
Etymology: Greek di- , two or double, and thyreos, shield, alluding to spectacle-shaped fruits
Treatment appears in FNA Volume 7. Treatment on page 607. Mentioned on page 237, 240, 571.
 TaxonIllustrator 
FNA7 P76 Dimorphocarpa wislizeni.jpegDimorphocarpa wislizeni
Dithyrea californica
Lyrocarpa coulteri
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey

Annuals or perennials; (rhizomatous); not scapose; densely pubescent, trichomes stalked, stellate to subdendritic, sometimes as simple clavate papillae on fruits. Stems erect or decumbent, branched basally and distally. Leaves basal and cauline; petiolate or subsessile; basal rosulate, petiolate, blade margins dentate, sometimes repand, rarely pinnatifid; cauline petiolate, sessile, or subsessile, blade margins entire, dentate, or repand. Racemes (densely corymbose), considerably elongated or not elongated in fruit. Fruiting pedicels divaricate, stout, (straight, with 2 well-developed glands basally). Flowers: sepals erect, linear or oblong-linear, (forming tube, connivent), lateral pair saccate basally; petals (erect), white, lavender, or purplish, lingulate, (longer than sepals), claw undifferentiated from blade; stamens (erect), tetradynamous; filaments not dilated basally, (filiform); anthers narrowly linear or sagittate; nectar glands: lateral annular, median confluent with lateral; (gynophore to 0.5 mm). Fruits silicles, sessile or shortly stipitate, didymous, not winged, strongly angustiseptate; valves 1-seeded, ovate, suborbicular, or slightly broader than long, keeled, enclosing seeds when falling off, indurated around margin, (rim raised), pubescent (with branched or clavate, simple papillae); replum concealed by valve margin; septum complete; ovules 2 per ovary; style distinct, (pubescent); stigma capitate, entire. Seeds aseriate, flattened, not winged, oblong; seed-coat (smooth), not mucilaginous when wetted; cotyledons accumbent. x = 10.

Distribution

sw United States, nw Mexico

Discussion

Species 2 (2 in the flora).

Key

1 Annuals; racemes elongated in fruit; fruit valves 3.5-5(-6) × 4-6(-7) mm, trichomes as simple, clavate papillae (stellate hairs absent or, rarely, restricted to fruit margins). Dithyrea californica
1 Perennials; racemes not elongated in fruit; fruit valves 8-11 × 8-10 mm, trichomes sessile, stellate, sometimes mixed with forked or, rarely, simple ones (clavate papillae absent). Dithyrea maritima

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

... more about "Dithyrea"
sagittate +  and linear +
Ihsan A. Al-Shehbaz +
Harvey +
appendaged +  and unappendaged +
repand +, dentate +  and pinnatifid +
much smaller +  and reduced +
urceolate +, campanulate +  and tubular +
branched +  and simple +
subsessile +, sessile +  and petiolate +
well-developed +
distinct +
undifferentiated +
not +  and differentiated +
Spectacle-pod +
emarginate +  and entire +
sw United States +  and nw Mexico +
straight +  and curved +
Greek di- , two or double, and thyreos, shield, alluding to spectacle-shaped fruits +
not winged +  and unappendaged +
connate +  and distinct +
tetradynamous +
purplish;lavender;purplish;lavender;white +
lingulate +
2-valved +  and capsular +
not winged +, stipitate +  and sessile +
angustiseptate +
latiseptate +  and unsegmented +
angustiseptate +  and terete +
subsessile +  and petiolate +
alternate +, not +  and rosulate +
cauline +  and basal +
connate +  and distinct +
decurrent +
sinuate;dentate;sinuate;dentate +
median +  and lateral +
tenuinucellate +, crassinucellate +  and bitegmic +
campylotropous +  and anatropous +
brown +, orange +, violet +, purple +, lavender +, yellow +  and white +
rudimentary +
cruciform +
trinucleate +  and 3(-11)-colpate +
London J. Bot. +
rollins1979c +
flattened +  and rounded +
mucilaginous +
not +  and mucilaginous +
white +, black +, brown +  and yellow +
oblong +  and flattened +
indurate +
oblong-linear +  and linear +
persistent +  and caducous +
distinct +
reduced +
latiseptate +, schizocarpic +, samaroid +  and lomentaceous +
indehiscent +  and dehiscent +
angustiseptate +, flat +, angled +, terete +, torulose +, not +, segmented +  and nutletlike +
tetradynamous +
procumbent +  and decumbent +
decumbent +  and erect +
entire +  and capitate +
2-lobed +  and entire +
subsessile +, sessile +  and petiolate +
persistent +
distinct +
Cruciferae +
Dithyrea +
Brassicaceae tribe Physarieae +
subdendritic +  and stalked +
forked +  and scale-like +
pubescent +  and glabrous +
keeled +, suborbicular +  and ovate +
slightly broader than long +
anastomosing +
perennial +  and annual +
perennial +, biennial +  and annual +
aquatics +  and terrestrial +
glabrous +  and pubescent +