[Vol. 9 



276 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



11. T. rhomboideum Greene, Pittonia 4: 314. 1.901. 



T. integrifolium Robinson in Gray, Syn. Fl. N. Am. I 1 : 176. 

 1895, in part. 



Pleurophragma platypodum Rydb. Bull. Torr. Bot. Club 34: 

 434. 1907; Rydb. Fl. Rocky Mountains, 368. 1917. 



Biennial, glabrous: stems erect, usually simple at the base 

 and paniculately branched above, 4-14 dm. high: radical leaves 

 oblanceolate, entire or sinuate-margined, 4-12 cm. long, usually 

 obtuse; cauline leaves narrowly lanceolate to linear, reduced up- 

 wards, sessile or subsessile: sepals white or pale purple; petals 

 white, narrowly spatulate, 6-8 mm. long; filaments 5-7 mm. 

 long, anthers about 2 mm. long, not apiculate; nectar glands 

 4, horn-like processes: inflorescence very dense, scarcely corym- 

 bose; pedicels 3-5 mm. long, horizontal or somewhat reflexed, 

 flattened conspicuously at the base: pods incurved, ascending, 

 irregularly torulose, 2-3 cm. long; stipe 1-2 mm. long; style 



about 1 mm. long, stigma small, entire or slightly 2-lobed over 

 the valves. 



Distribution: western Colorado, Utah, and Nevada. Type: 

 Greene from "the west Humboldt Mountains, Nevada." 



Specimens examined: 



Colorado: Hayden, Routt County, Aug. 6, 1903, Goodding 1789 

 i(Mo. Bot. Gard. Herb, and Rky. Mt. Herb.) ; Hot Sulphur 

 Springs, Middle Park, Aug. 1, 1881, G. Engelmann (Mo. Bot. 

 Gard. Herb.); Montrose or Ridgway, 1897, Bethel (Bethel 

 Herb.). 



Utah: Moab, Aug. 30, 1891, Jones (Univ. Calif. Herb., Rky. 

 Mt. Herb., and Mo. Bot. Gard Herb.). 



Arizona: near Tuba, Painted Desert, July 15-31, 1920, Clute 

 82 (Mo. Bot. Gard. Herb.). 



Nevada: spring in pass of Goshoot Mountains, July 20, 1859, 

 H. Engelmann 111 (Mo. Bot. Gard. Herb.); Wadsworth, Aug., 



187(1, E. Palmer 22 (Univ. Calif. Herb, and Mo. Bot. Gard. 

 Herb.); Reno, Aug. 13, 1889, Hillman (Univ. Calif. Herb.); 

 Truckee Pass, Washoe County, Sept. 15, 1909, Heller 9958 (Mo. 

 Bot. Gard. Herb.). 



It has been impossible to examine the type specimen of T. 

 rhomboidcum, since it can not be located at the Greene Her- 

 barium at Notre Dame nor in other collections in which it might 

 be expected. This uncertainty as to the identity of the type is 

 complicated because the original description is far from com- 

 plete. However, since only one species of this group is known 



