Flora of North America species comparison

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Sibara

wing rockcress
Habit Annuals; not scapose; (usually glaucous), pubescent or glabrous, trichomes simple, 2-forked, dendritic.
Stems

erect, unbranched or branched distally.
Leaves

basal and cauline;

petiolate;

basal rosulate or not, blade margins pectinate or pinnatisect;

cauline blade (base not auriculate), margins pectinate or pinnatisect, (terminal lobes filiform and semiterete, or linear and flat).
Racemes

(several-flowered), considerably elongated in fruit.
Flowers

sepals erect, oblong [ovate], lateral pair not saccate basally (usually glabrous, rarely pubescent);

petals white, purple, or lavender, spatulate [oblanceolate] (longer than sepals), claw differentiated from blade, (often oblanceolate, equal to or longer than sepals, apex obtuse to emarginate);

stamens slightly tetradynamous;

filaments not dilated basally;

anthers ovate or oblong;

nectar glands lateral, semi-annular or annular, median glands absent.
Fruiting pedicels

divaricate-ascending, divaricate, horizontal, or reflexed, slender [stout].
Fruits

sessile or shortly stipitate, linear, smooth or torulose, latiseptate [terete];

valves each with prominent or obscure midvein, pubescent or glabrous;

replum rounded;

septum complete;

ovules [14–]16–40[–94] per ovary;

style distinct;

stigma capitate, entire.
Seeds

uniseriate or biseriate, (yellowish brown), flattened or plump, not winged, oblong;

seed coat not mucilaginous when wetted;

cotyledons accumbent [incumbent].
x

= 13, 14.

Sibara
Distribution
from USDA
sw United States; n Mexico
[BONAP county map]
Discussion

Species 6 (2 in the flora).

As recognized by R. C. Rollins (1947, 1993), the limits of Sibara are highly artificial. One of the ten species that he recognized, S. virginica, is here placed in the monotypic genus Planodes of the tribe Cardamineae. Another, S. viereckii, is assigned to Dryopetalon, and S. grisea is reduced to synonymy under Thelypodium texanum. The four Mexican species recognized in the genus are S. angelorum (S. Watson) Greene (Baja California, Sonora), S. brandegeeana (Rose) Greene (Baja California), S. laxa (S. Watson) Greene (Baja California), and S. mexicana (S. Watson) Rollins (Guanajuato).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Plants pubescent; petals 2-3.5 × 0.5-1 mm; fruits often curved, (0.8-)1.2-2.5(-3.2) cm × 1.2-1.5 mm; ovules 16-24 per ovary; deserts of e California, s Nevada.
S. deserti
1. Plants glabrous; petals 3.5-6 × 2-3 mm; fruits straight, 2.5-4.1 cm × 0.7-0.9 mm; ovules 32-40 per ovary; Santa Cruz Island, California.
S. filifolia
Source FNA vol. 7, p. 692. Author: Ihsan A. Al-Shehbaz.
Parent taxa Brassicaceae > tribe Thelypodieae
Subordinate taxa
S. deserti, S. filifolia
Name authority Greene: Pittonia 3: 10. (1896)
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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