18 . PLANTJS WRIGHTIAN^. "VI, 



Arenaria diffusa, Ell. Sk. 1. p. 519. A. nemorosa, H. B. K. Nov. Gen. Sf Spec. 

 1. p. 35. Spergulastrum lanuginosum, Michx. Stellaria elongata, Nutt. S. lanu- 

 ginosa, Ton: ^ Gray, Fl. 1. j)- 187 ; Gray, PI. Fendl. p. 13. Hills near the cop- 

 per mines, New Mexico; and near Santa Cruz, Sonora. (864.) — This is a true 

 Arenaria, as the genus is characterized by Fenzl. The petals, which are present in 

 some of these specimens, are entire, and nearly as long as the calyx. This species 

 extends southward to the Quitensian and the Peruvian Andes. The testa of the 

 seed is very smooth and shining. In the nearly allied A. Benthamii, which Mr. 

 Wright formerly gathered in Texas, the testa is tuberculate. 



A. SAXOSA (sp. nov.) : multiceps e radice perenni ; caulibus subsimplicibus erectis 

 |2- 3-pollicaribus) foliosissimis puberulis ; foliis oblongo-lanceolatis acutato-mu- 

 cronatis uninerviis glabriusculis subcarnosis ; pedunculis folia sequantibus ; sepalis 

 ovato-oblongis acutis margine scariosis carinato-uninerviis petalis brevioribus. — 

 Stony hills at the copper mines. New Mexico ; Aug. (865.) — Stems very numerous 

 and tufted, erect, or somewhat spreading, very leafy, 1 - 5-flowered. Leaves 2 or 3 

 lines long, crowded, longer than the internodes, minutely scabrous-puberulent, 

 scarcely ciliolate, thickish, rather strongly one-nerved. Peduncles simple, 2 - -l-lines 

 long. Sepals about 2 lines long, a little shorter than the obovate-oblong white petals. 

 Stamens 10 : filaments glabrous. Styles 3. Ovary globose-ovoid, about 40-ovulate. 

 Capsule rather longer than the calyx, 3-valved at the apex ; the valves soon 2-cleft. 

 Seeds rather numerous, smooth, not strophiolate. — The plant I named Moehringia 

 umbrosa in PI. Fendl. p. 13, is probably a form of the present species, with a looser 

 mode of growth, and with much longer and smoother leaves. I have no fruit of 

 that plant. The present plant has estrophiolate seeds, and therefore cannot be a 

 Moehringia. 



Cerastium vulgatum, Linn. ; Fenzl in Ledeb. Fl. Ross. 1. p. 408. C. triviale, 

 Aiict. Ravines, on the Organ Mountains, New Mexico, April. (1323.) 



Drymaria glandulosa, Bartl. in Presl, Pel. Hcenk. 2. p. 9. D. ramosissiraa, 

 Schlecht.in Linncea, 12.j>. 206] D. cordatal Gray, PI. Fendl. p. 13. New Mexico 

 near the copper mines ; Aug. and Oct. (866.) — Distinguished from D. cordata by 

 the viscid-glandular pubescence of the branches, pedicels, and calyx ; the more 

 glomerate flowers ; and the longer, sharply acuminate sepals. The specimens stick 

 to the paper in which they were dried. The stamens are only 3.* 



* No. 722 of Coulter's Mexican collection can hardly be separated with propriety from this genus, al- 

 though it has entire petals and axillary flowers. It may be characterized as follows : — 



Drymaria xerophylla (sp. nov.): glabra; caulibus decumbentibus ramisque floridis foliosis ; foliis 

 subsessilibus ovatis cuspidato-acuminatis chartaceo-membranaceis siccis 3-5-plinerviis venosis ; stipulis 

 plurisetosis ; cymulis axillaribus 1 - 5-floris subsessilibus folia baud superantibus ; sepalis oblongis obtusis 

 3-nerviis ; petalis minimis spathulatis integris ; ovario 3-ovulato. — The petals, which are not half the 

 length of the sepals, are quite entire, or barely emarginate, or rarely one or two of them 2-lobed at the 

 apex ; they appear to be hypogynous. The stamens are only 3, with their filaments dilated at the base 

 and connate into a ring. Capsule three-valved, one-seeded ; the seed smooth. Embryo as in the genus. 

 Leaves 3 to 5 lines in length. 



D. polycarpoides, PL Fendl. I. c, is, I believe, not distinct from D. crassifolia, Benth. Bot. Voy. Sulph., 

 which is the species inadvertently referred to under the name of D. glauca. 



