242 BRASSICACEAE 



entire upwards; inflorescence 3-6 dm. long; pedicels horizontal or ascending, commonly less 

 than 1 cm. long ; sepals reflexed in anthesis ; petals golden yellow, 12-16 mm. long, usually with 

 a broad blade and narrower woolly claw ; stamens subequal ; anthers coiled at maturity ; pods 

 often torulose, 3-7 cm. long, ascending or arcuate-recurved; stipe 1-3 cm. long. 



Dry flats and hills, Upper Sonoran Zone; Idaho and Nevada to southern California, Utah, Colorado, 

 Wyoming, and the plains of South Dakota, Nebraska, and Kansas. Type locality : In upper Louisiana. April- 

 Sept. 



2. CHLOROCRAMBE Rydb. Bull. Torrey Club 34: 435. 1907. 



Perennial herb with rather stout, erect stem and thin, petioled, more or less hastate 

 leaves. Flowers greenish yellow, in loose, virgate racemes. Sepals similar, spreading. 

 Petals dentate or laciniately toothed laterally. Pods widely spreading, subterete, shortly 

 stipitate; stigma entire; cells of the septum elongated parallel to the replum, not tortuous. 

 Seeds neither winged nor margined ; cotyledons obliquely accumbent. [From the Greek 

 chloros, green, and crambe, a Greek name for a genus of this family.] 



A monotypic genus of western North America. 



1. Chlorocrambe hastata (S. Wats.) Rydb. Chlorocrambe. Fig. 1922. 



Caulanthus hastatus S. Wats. Bot. King Expl. 28. 1871. 

 Chlorocrambe hastata Rydb. Bull. Torrey Club 34: 435. 1907. 



Glabrous throughout, the stem simple or sparingly branched, 6-15 dm. high. Leaves ample, 

 except the uppermost, broadly deltoid, hastate or lanceolate, entire or coarsely and irregularly 

 lobed, 5-10 cm. long, base truncate or sometimes subcordate ; petioles of lower leaves frequently 

 appen'daged with several entire or lobed segments of the blade ; uppermost leaves much reduced, 

 narrowly lanceolate, entire; sepals greenish, narrowly lanceolate, about 6 mm. long, slightly 

 spreading, distant ; petals whitish, somewhat exceeding the sepals, irregularly dentate or sub- 

 laciniate laterally toward the base; filaments distinctly longer than the petals; pods widely 

 spreading, subterete, slightly flattened parallel to the septum, 4-7 cm. long ; stipe 1-7 mm. long ; 

 style very short ; stigma capitate, entire. 



Transition Zone; northern Utah and the Wallowa Mountains, Oregon. Type locality: "On shaded slopes 

 in the Wahsatch and Uinta Mountains," Utah. June-July. 



3. THELYPODIUM Endl. Gen. 876. 1839. 



Biennial or perennial herbs, with mostly erect simple or branched stems, glabrous or 

 pubescent with simple hairs. Stem leaves frequently sagittate at base. Inflorescence 

 usually racemose, rarely corymbose. Flowers purple, lilac, rose-colored or white; petals 

 linear, oblong or oblanceolate, entire. Pods terete or slightly flattened parallel to the 

 partition, stipitate or sessile, horizontal to erect ; style short ; stigma small, entire or very 

 slightly 2-lobed; septum with a mid-band due to the elongation of the cells in that region. 

 Seeds not winged; cotyledons usually obliquely incumbent. [Name from the Greek, 

 meaning female and foot, on account of the stipitate ovary of some species.] 



A genus of about 12 species peculiar to western North America. Type species, Thelypodium laciniatum 

 (Hook.) Endl. 



Cauline leaves sagittate or amplexicaul. 

 Biennials or short-lived perennials. 



Raceme dense, narrow, spike-like; pedicels rarely over 5 mm. long. 

 Fruiting pedicels divergent, 1-3 mm. long. 



Petals red-purple; pedicels 2-3 mm. long. 1. T. eucosmum. 



Petals white; pedicels stout, 1 mm. long. 2. T. brachycarpum. 



Fruiting pedicels slender, erect, 3-5 mm. long. 3. T. crispum. 



Raceme lax and narrow, or, if dense, corymbose and broader; pedicels usually more than 5 mm. long. 

 Petals spatulate or broader. 



Inflorescence distinctly racemose; basal leaves lyrately toothed. 4. T. Howellii. 



Inflorescence corymbose or shortly racemose; basal leaves entire. 5. T. sagittatum. 



Petals filiform; inflorescence racemose. 6. T. stenopetalum. 



Perennials; caudex clothed with the papery remains of old leaf-bases. 7. T. flexuosum. 



Cauline leaves not sagittate or amplexicaul. 



Fruiting racemes dense, spike-like; biennials. 



Stem leaves toothed or lobed. 8. T. laciniatum. 



Stem leaves entire. 9. T. integrifolium. 



Fruiting raceme open; annuals. 



Petals 8-15 mm. long, yellow, crisped. 10. T. flavescens. 



Petals 4-5 mm. long, flat. 



Sepals purple, spreading. H. T.Lemmonii. 



Sepals green or yellowish, erect. 12. T. lasiophyllum. 



1. Thelypodium eucosmum Robinson. Red-purple Thelypodium. Fig. 1923. 



Thelypodium eucosmum Robinson in A. Gray, Syn. Fl. N. Amer. I 1 : 175. 1895. 



Probably biennial, glabrous and more or less glaucous throughout. Basal leaves oblanceolate, 

 subentire ; stem leaves 2-6 cm. long, usually acute ; sepals reddish purple, narrow, 6-7 mm. long, 



