: .-■"• 



190 BOTANY OF THE DEATH VALLEY EXPEDITION. 



Chorizanthe xanti Wats. Proc. Amer. Acad. xii. 272 (1877). Type localities, 

 "near Fort Tejon," "San Bernardino," and "San Gorgonio," all in California. 



In the southern Sierra Nevada (Nos. 1033, 1100). No. 1033 has a deep pink calyx 

 and a more reddish color throughout, together with less leaf-like lower bracts than 

 No. 1100. 



Phyllogonum luteolum sp. nov. 1 Plate XXI. 



Plant annual, prostrate, of a yellowish green color throughout; lowest internode 

 sometimes 6.5 em. long; nodes subtended by a whorl of three leaves and giving rise 

 to 3 or 5 branches; stem and branches terete, reaching 2 mm. in diameter, nearly 

 glabrous below like the leaves, scantily provided above, like the pedicels and peri- 

 anth, with divergent but ilexuous hairs, in ago probably glabrous; radical leaves 

 and those of the lower nodes with a broadly oblong or obovato, obtuse, 3-nerved 

 blade 10 to 15 mm. long, tapering abruptly into a petiole 15 to 30 mm. long; upper 

 leaves becoming smaller, shorter-petioled, and at last sessile; inflorescence made 

 up of fascicles of about 5 or 6 flowers inserted at the node, apparently in the axil of 

 the upper leaf, without involucre and without bracts; upper fascicles becoming 

 contiguous and congested into leafy-bracted glomerules terminating the branches; 

 pedicel 5 mm. long or less, jointed at the base of the flower; perianth yellow, 1.5 

 to 2 mm. long; divisions 0, oblong-linear, obtuse, equal in the open flower, in the 

 * fruiting perianth the outer three only three-fourths as long as the inner; stamens 

 !); filaments filiform, two-thirds as long as the perianth; anthers orbicular 0.25 mm. 

 long; styles 3,0.5 mm. long, slightly enlarged at the apex, deciduous; aehenium 

 butt-colored, elliptical, triangular in transection, smooth and shining, 1.5 mm. Ion"; 

 embryo nearly straight; radicle lying along one angle of the seed; cotyledons or- 

 bicular, lying at the base of the seed, bent at an angle of about 45° from the radicle. 



Ten polygonaceous genera are now referred to the tribe Eriogoneai (including Kocni- 

 giese). Of these, five, EHogomtm, Chorizanthe (including Centrosteyia), Oxythcca, IIol- 

 Hstcria, and Lastarricea bear their flowers in di- to penta-phyllous involucres; four 

 Xemacaiilis, Harfovdia, Pterostegia, and Kcenitjia, bear their flowers (the pistillate 

 ones only in Harfordia) in the axils of monopbyllous but sometimes involucriform 

 bracts; while the new genus PhyUogonum has neither bract nor involucre. In 

 structural characteristics it is most nearly related to Nemacaulis. Its vegetative 

 character of three well-developed distinct leaves subtending each node distinguishes 

 the plant from Nemacaulis, Lastarr'ura, llollixtcria, and Oxythcca, the genera with 

 which it is most likely to be confounded. In the peculiar yellowish color of the 

 herbage, in the form of the lower leaves, and in habit, the species resembles Oxythcca 

 htteola, which Dr. Parry atone time considered the type of a new gen ns, Gymnogonum; 

 but the conspicuous 5-parted involucre of that plant is entirely wanting in PhyUo- 

 gonum. 



Type specimen in the United States National Herbarium, No. 584, Death Valley 

 Expedition; collected April 7, 1891, in Furnace Creek Canon, Funeral Mountains, 

 InyoCounty, California, by Frederick V. Coville. Only two specimens were collected, 

 growing in the dry wash of the canon about 2.5 kilomotors above Furnace Creek 

 Ranch. 



iPhyllogormm gen. nov. 



Polygonacearum genus Eriogoneis affine. Nodi foliis tribuslierbaceispetiolatism- 

 structi. Florcs lutei, pedicellati, ad nodos fasciculati, sine involucro sine braetea, 

 facie in axilla folii, inserti, fasciculis superis brevitate internodorum adjacent ibus, 

 demum confluentibus. — Plants annua, prostrata, divergente raniosa, omninoluteola, 

 ramis e nodo singulo tribus ant quinque, imequalibus. 



Nomen genericum e tyv'klov et ybvv derivatum est, nodi enim folia tria plene ex- 

 pansa, nee ut ploruinquo in geueribus propinquis bracteis reducta, gerunt. 



