

FLOWERING PLANTS AND FERNS OF ARIZONA 349 



forests, February to August, type of T. purparascens collected "in 

 Arizona" without definite locality (Palmer 571). Colorado, Utah, 

 New Mexico, and Arizona. 



Sometimes called wild-candytuft. 



12. SISYMBRIUM * 



Plants of diverse appearance, annual, or perennial; stems simple or 

 branched; leaves entire, dentate, or pinnatifid, the stem leaves some- 

 times with auriculate-clasping bases; flowers in racemes; petals yellow 

 or purple; style short or obsolete; stigma nearly entire, or 2-lobed with 

 lobes over the partition and placentae; pods terete, slender. 



It is doubtful that all of the following species belong properly to 

 this genus. 



Key to the species 



1. Stem leaves auriculate-clasping; petals purple, their blades flat or nearly so (2) . 



2. Petals 10 to 15 mm. long, rich violet purple; anthers becoming curled or 



coiled; pods distinctly stipitate, the stipe 2 mm. long or longer; stem tall 



and stout; basal leaves dentate 1. S. ambiguum. 



2. Petals less than 10 mm. long, pale purple; anthers becoming curved and 



somewhat twisted; pods nearly sessile, the stipe not more than 1 mm. long. 



2. S. ELEGAXS. 



1. Stem leaves not auriculate-clasping; petals yellow (3). 



3. Leaves all or nearly all entire and linear or narrowly lanceolate, the basal 



ones sometimes pinnatifid; petals more or less crisped or somewhat 

 cucullate; pods erect or ascending, very slender, 3 to 7 cm. long; anthers 



deeply sagittate 3. S. lixifolitjm. 



3. Leaves all or nearly all pinnate or pinnatifid; petals flat or nearly so; pods 

 eventually spreading (4) . 

 4. Plants glabrous or very sparsely hirsute near the base; divisions of the 

 upper stem leaves never filiform: pods at maturity 4 to 5 cm. long, 



not rigid; anthers scarcely sagittate 4. S. irio. 



4. Plant hirsute up to the inflorescence, usually very sparsely so above; 

 divisions of the upper stem leaves very narrow, often nearly filiform; 

 pods at maturity more than 5 (up to 10) cm. long, becoming rather 

 rigid; anthers often pronouncedly sagittate 5. S. altissimum. 



1. Sisymbrium ambiguum (S. Wats.) Pavson, Wyo. Univ. Pubs. 



Bot. 1: 11. 1922. 



Thely podium ambiguum S. Wats., Amer. Acad. Arcs and Sci. 

 Proc. 14: 290. 1879. 



Mohave and Coconino counties, 3,000 to 6,000 feet, March to June, 

 type from Long Valley, Coconino County (Newberry). Also in 

 southern Utah. 



A coarse plant but very showy when in flower. 



*2. Sisymbrium elegans (M. E. Jones) Pavson, Wyo. Univ. Pubs. 

 Bot. 1: 13. 1922. 



Thely podium elegans M. E. Jones, Zoe 4: 265. 1893. 

 Thelypodiopsis elegans Rvdb., Torrev Bot. Club Bui. 34: 432. 

 1907. 



Not known definitely to occur in Arizona but has been collected at 

 Kanab, Utah, very near the Arizona State line. Colorado and Utah. 



Reference: Payson, E. B. species of sisymbrium native to north America north of icexico. 

 Wyo. Univ. Pubs. Bot. 1: 1-27. 1922. 



