ROBINSON AND GREENMAN. — MEXICAN PLANTS. 47 



branched, terminal, leafj-bracted at the base ; bracts oblong-lanceolate, 

 acute; pedicels finely grayish-tomentulose ; heads rather small, numerous, 

 radiate, few-flowered; involucral scales about o-seriate ; the outer consid- 

 erably shorter, linear-oblong, obtuse, 1 to H lines long with subherbaceous 

 tips ; inner scales subscarious, about 3 lines long, u line broad, acute, 

 glabrous, except the ciliolated margins: disk-flowers about 12 ; corollas 

 glabrous ; ray-flowers 2 to 3 ; ligules goldeu-yellow, 3^ to 4 lines long : 

 mature achenes 2 lines long, conspicuously winged on each margin, 

 hispidulons on the surfaces ; awns subequal. — Collected by C. G. 

 Priiigle, in rocky gulches, Monte Alban, Oaxaca, altitude 5, GOO feet, 

 15 August, 4 October, 1894, no. 4875. 



Verbesina variabilis. Shrub : branches striate-angled, mostly 

 wingless and nearly glabrous : branchlets hoary-puberulent or glabrous, 

 usually bearing narrow irregular deciduous brown corky wings de- 

 current from the bases of the petioles : leaves alternate, short-petioled, 

 ovate or lance-oblong, sharply and finely serrate or mucronulate-den- 

 ticulate, acute to shortly acuminate at the apex, cuueately narrowed at 

 the base, 2 to 3 inches long, 9 to 12 lines broad, above green, strigillose- 

 puberuleut and very scabrous to nearly smooth ; below scarcely paler, 

 soft-pubescent on the pinnate and reticulated veins or quite glabrous : 

 heads of middle size in terminal subsimple or compound corymbs, 

 pedicels grayish-tomeutose to merely puberulent: involucral scales about 

 2-seriate, green, oblong, obtusish ; ray-flowers 10 to 12, yellow; ligules 

 6 lines long, about 2 lines broad, finely 2-3-dentate at the apex ; disk- 

 flowers about 60, pubescent : chaff cuneate, the apex truncate with 

 short recurved apiculus : achenes very narrowly winged on both margins, 

 about H lines long: awns 2, subequal. — Collected in three rather 

 different forms, which, however, appear to have no satisfactory specific 

 differences. The first, which may be regarded as the typical form, has 

 rather broad dull green very pubescent leaves. It was collected by 

 C. G. Priiigle, Sierra de San Felipe, altitude 9,500 feet, 24 September, 

 1894, no. 4918, by E. W. Nelson, 18 miles southwest of the city of 

 Oaxaca, altitude 7,500 to 9,500 feet, 10-20 September, 1894, no. 1393, 

 and by C. Conzatti on Sierra de San Felipe, altitude 9,000 feet, 29 

 November, 1895, no. 31. A second form collected by Mr. Nelson on 

 the top of the Sierra Madre near Chilpancingo, Guerrero, altitude 9,000 

 to 10,200 feet, 24 December, 1894, no. 2240, differs only in having 

 narrower oblong leaves, which are somewhat lucid above and somewhat 

 less pubescent. A third form, secured by Mr. Nelson at same place and 

 date, no. 2215, has narrow oblong leaves, which are quite glabrous 



