80 PLANTS WRIGHTIAN^, T. 



EUBIACEJE. 



234. Galium (Relbunium) microphyllum (sp. nov.): glaberrimum, humile; 

 caule csespitoso ramosissimo difFuso ; foliis quaternis lineari-lanceolatis arete sessili- 

 bus rigidulis mucronatis marginibus nervoque valido Igevissimis pedunculos unifloros 

 sequantibus ; flore cum fructu glabro in involucro tetraphyllo sessili. — Mountains 

 at the Pass of the Limpia, in crevices of rocks, and in the valley of the Limpia ; 

 Aug. — Eoot perennial, reddish. Stems a span long, herbaceous, slender, very 

 leafy ; the strong obtuse angles, like the whole plant, perfectly smooth. Leaves 

 two or three lines long, their sessile bases almost connate, the lower lanceolate. 

 Peduncles axillary, one-flowered, but the four-leaved involucre is sometimes prolifer- 

 ous. Involucre like the ordinary leaves, longer than the small, " yellow," tetramerous 

 flower, and the glabrous, but minutely pruinose fruit. Lobes of the corolla ovate, 

 obtuse. — This should be compared with Eubia laevigata, DC, described from 

 Hsenke's collection, which has ovate-oblong or ovate-lanceolote leaves. — Younger 

 specimens, barely in flower, are in the collection of 1851; their lower leaves 

 oblong-lanceolate.* 



J G. viRGATUM, Nutt, var. diffusum : caulibus demum ramosis laxis ; peduncu- 

 lis vel ramis floriferis plerisque folia superantibus ssepe proliferis. — Western bor- 

 ders of Texas; coll. of 1851. — Each flower is subtended either by a pair of leaf- 

 like bracts, as in the ordinary G. virgatum, or by a whorl of four leaves ; from which 

 the branch is sometimes proliferous. 



235. G. (Trichogalium) Wrightii (sp. nov.) : suffruticosum ; caulibus ramosis- 

 simis diffusis ramisque hirsutis ; foliis quaternis oblongis submembranaceis uniner- 

 viis utrinque pilis patentibus hirsutis ; floribus pedicellatis in cymulis terminalibus 

 laxis ; corolla rubro-purpurea ; fructu setis longis apice non uncinatis hispidissimo. 

 — Crevices of rocks, on mountains, in the Pass of the Limpia ; Aug. — Stems 6 to 

 12 inches high from a thick woody base; the branches slender. Leaves from two 

 to four lines long, sessile, obtuse, often setose-apiculate. Corolla half a line in di- 

 ameter, deep red-purple, the lobes acuminate. Bristles of the fruit white, straight, 

 rather longer than its diameter. f 



236. Bouvardia hirtella, H.B.K. Nov. Gen. Sf Sp. 3. p. 384. Hill-sides in 

 the Pass of the Limpia; Aug. (Northern Mexico, Wislizenus, Gregg ; and near 

 the city of Mexico, Gregg.) It appears to pass into the pubescent form of what is 

 called B. Jacquinii. Some specimens in the collection of 1851 have more herba- 

 ceous and strict stems, larger leaves, the upper in whorls of from four to seven, and 

 larger flowers. J 



* No. 186 of Coulter's Mexican collection (from Zimapan) is a nearly related species, perhaps a mere 

 variety, with the margins of the leaves sparsely setose. 



t Galium sufTruticosum, Null, in Torr. Sf Gray, Fl. 2. p. 21, has a name which is preoccupied for 

 a Chilian species by Hooker and Arnott. It may therefore be called G. Nuttallii. 



X Bouvardia glaberrima, Eiigelm. in Wisl. N. Mex. p. 106, is B. splendens, Graham in Bot. Mag., 

 and also apparently the Houstonia coccinea, Andr. Bot. Repos. I. 106, and the Lxora coccinea, Cav. 

 Ic. 4. t. 305. 



