2138 
coarsely dentate, the strigose pubescence of the lower face canescent: loose involu- 
cral bracts nearly in a single series: fructiferous bracts cartilaginous or bony, terete, 
in age often tuberculate. ((@ymnopsis uniserialis Hook. Aldama uniserialis Gray).— 
Moist or shady ground, southern and western Texas. 
56. ECLIPTA L. 
An annual rough herb, with slender stems, opposite leaves, solitary 
small radiate heads of white flowers, perfect and fertile (4-toothed) disk- 
flowers, 10 to 12 leaf-like ovate-lanceolate involucral bracts in 2 rows, 
flat receptacle with almost  bristle-form chaff, short 3 or 4-sided (or 
latterally flattened in the disk) achenes hairy at summit, and pappus 
none or an obscure denticulate crown. 
1, BE. alba Hassk. Rough with fine appressed hairs: stems procumbent or ascend- 
ing, 3 to 6 dm, high: leaves lanceolate or oblong, acute at each end, mostly sessile, 
slightly serrate: rays equaling the disk. (EF. procumbens Michx.)—Shores and river 
banks, throughout Texas. 
57. VARILLA Gray. 
Shrubby glabrous plants, with linear and narrow entire and sessile 
thickish or fleshy leaves, pedunculate rather small discoid heads of yel- 
low flowers (solitary in ours), all the flowers perfect and fertile, short 
involucre of few small linear-lanceolate appressed-imbricate bracts sim- 
ilar to those of the (at length) high conical or oblong receptacle, nar- 
row linear-oblong terete 8 to 15-nerved achenes, and no pappus (in 
ours). 
1. V. Texana Gray. Low, suffrutescent, much branched and very leafy at base: 
leaves very succulent, terete, mostly alternate, obtuse: head solitary on a long ter- 
minal and minutely bracteate peduncle.—Saline soil, from the Nueces to the Rio 
Grande (as far up as Eagle Pass). 
58. ISOCARPHA R. Br. 
Herbs, with opposite leaves, small discoid heads of white or whitish 
flowers (solitary or glomerate at the summit of a naked peduncle), all 
the flowers perfect and fertile, involuere, receptacle and dry bracts 
nearly of Varilla, and small 4 or 5-angled little compressed achenes des- 
titute of pappus. 
1. I. oppositifolia R. Br. Pubescent: stems slender, 3 to 9 dm. high, paniculately 
branched: leaves lanceolate, narrowed to both ends, 3-nerved, entire or sparingly 
denticulate: heads commonly in threes, in fruit 8 to 10mm. long: bracts of involucre 
and receptacle pointed, becoming rigid and the receptacle columnar.—Along the 
Rio Grande. 
59. SPILANTHES Jacq. 
Usually spreading or creeping herbs, with opposite serrate leaves, 
small heads with yellow rays on peduncles terminating the stem and 
branches, ray and disk-flowers fertile, involucre of few loosely appressed 
herbaceous bracts, chaff of the (at length) subulate-conical receptacle 
soft and more or less embracing the achenes, ray-achenes 3-sided or 
