Standley — Five New Plants from New Mexico. 117 



Amsonia arenaria Standley sp. nov. 



Perennial from a thickened woody root ; stems stout, erect, 14 to 50 cm. 

 high, much branched above the base, the branches ascending or spread- 

 ing, tomentose with branched white hairs; leaves numerous, linear, or 

 the lowest rarely lance-linear, 20 to 55 nun. long, :'. mm. wide or less, 

 acutish, sessile, thick and somewhat fleshy, I -nerved, abundantly tomen- 

 tose when young, glabrate in age; flowers numerous, in rather dense 

 clusters, these shorter than the leaves; pedicels 4 mm. long or less, some 

 of the flowers usually sessile; calyx 5 to 7 mm. long, tomentose, soon 

 Incoming glabrate, the lobes lanceolate, with long subulate tips; corolla 

 salverforin, the tube 8 to It) mm. long, dilated upward, constricted at the 

 mouth, glabrous outside, pubescent within, the lobes of the limb oblong 

 or oblong-obovate, S mm. long, obtuse, spreading; stigma spherical, with 

 two rounded lobes above; follicles stout, 4 to 9 cm. long, constricted 

 between the seeds, attenuate at the apex, sessile, tomentulose when young, 

 glabrate in age, 1 to 3-seeded; seeds 8 to 23 mm. long, elliptic or nar- 

 rowly oblong in outline, obtuse or truncate at the ends, pale brown. 



Type in the I'. S. National Herbarium, No. (j^l,049, collected on sand- 

 hills between Strauss and Anapra, near the southeast corner of Dona Ana 

 County, New .Mexico, in July, 1912, by Elmer Stearns (No. 372). The 

 locality is near El Paso, Texas, on the west side of the Rio Grande. 



The type specimens bear fruit only, and the description of the flowers 

 is based upon Pringle's 6796 and part of the Mexican Boundary Survey's 

 No. 1053, cited below. 



Amsonia arenaria is nearest A. tomentosa Torr., and some of the 

 material referred here was determined as that species by Gray and Torrey. 

 The two occupy entirely different ranges, A. tomentosa being known 

 only from northern Arizona, southern Utah, Nevada, and southern Cali- 

 fornia. The latter has lanceolate to ovate leaves which are permanently 

 tomentose and give the plant a whitish appearance that is characteristic 

 even in age. Amsonia arenaria is somewhat grayish when young, but 

 -.»,n loses most of its pubescence and appears a dull dark green. 



Additional specimens examined: 



New Mexico : On sandhills, San Andreas Mountains, Dona Ana County, 

 September 23, 1912, Wootpn. 



Chihuahua: Between Eaguna de < iuzman and Laguna de Santa Maria, 

 1891, Hartman 724; gravelly plains near Lake Guzman, alt. 1200 meters, 

 1898, Pringh 6796. 



Without definite locality: Mexican Boundary Survey 1053, in part. 



Upon the National Herbarium sheet of No. 1053 collected by the Mexi- 

 can Boundary Survey are three branches, each representing a different 

 species. One is Amsonia arenaria, another is A. hirtella, and the third 

 represents an apparently undescribed species. This last is perfectly glab- 

 rous and resembles A. longiflora, but the flowers are much smaller than 

 in that species. It is probably the plant from Lake Santa Maria, Chi- 

 huahua, referred to by Torrey* as a glabrous form of A. tomentosa. 

 •U. S. an.l Mex. Bound. Bot. 158. 1859. 



