Flora of North America species comparison

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Dithyrea

shieldpod, spectacle-pod
Habit 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.
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).
Fruiting pedicels

divaricate, stout, (straight, with 2 well-developed glands basally).
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.

Dithyrea
Distribution
from USDA
sw United States; nw Mexico
[BONAP county map]
Discussion

Species 2 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
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).
D. 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).
D. maritima
Source FNA vol. 7, p. 607. Author: Ihsan A. Al-Shehbaz.
Parent taxa Brassicaceae > tribe Physarieae
Subordinate taxa
D. californica, D. maritima
Name authority Harvey: London J. Bot. 4: 77, plate 5. (1845)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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