WOOTON AND STANDLEY—NEW PLANTS FROM NEW MEXICO. 145 
sparse, or at least not dense, stellate pubescence; upper leaves lanceolate or 
narrowly oblong, acute; flowers densely clustered, on stout pedicels 5 mm. long; 
sepals 5 or 6 mm. long, oblong, acute, densely stellate-pubescent ; staminate 
flowers with oblong, ciliate, acute petals; pistillate flowers apetalous; styles 38, 
bipartite; seeds oblong, brownish gray, 4.5 mm. long, with a stipitate caruncle. 
Type in the U. S. National Herbarium, no. 234163, collected by Dr. E. A. 
Mearns at Dog Spring in the Dog Mountains, September 16, 1893 (no. 2336). 
ADDITIONAL SPECIMENS EXAMINED: Parkers Well, July 19, 1901, Wooton. 
Similar to C. corymbulosus, but the two surfaces of the leaves are dissimilar 
in color, the upper being greener and much less densely pubescent; the upper 
leaves, too, are acute instead of obtuse, the petals are acute, and the sepals 
longer. 
Croton luteovirens Wooton & Standley, sp. nov. 
A slender, branched annual, 80 cm. high or less; stems glabrous, yellowish ; 
petioles slender, glabrous, one-third to one-half as long as the blades, these 
oblong-lanceolate, glabrous, yellowish green, acute; fiowers few, scattered, only 
a few in each raceme; sepals lanceolate, with a few stellate hairs, acute; 
petals wanting; capsules sparingly stellate-pubescent when young, soon glabrous; 
seeds broadly oval, 3 mm. long, light and dark brown striped, with an incon- 
spicuous caruncle. 
Type in the U. S. National Herbarium, no. 690282, collected on the Rio Gila, 
August 15, 1902, by E. O. Wooton. 
The plant is very abundant in this region, growing with the related C. tezr- 
ensis. Patches of the two are distinguishable at a distance because of their 
different color. Croton texensis is stellate-pubescent throughout, while our 
plant is glabrous; thus the two may be separated at a glance. 
Tithymalus altus (Norton) Wooton & Standley. 
Euphorbia alta Norton, Rep. Mo. Bot. Gard. 11: 108. 1899. 
Tithymalus chamaesula (Boiss.) Wooton & Standley. 
Euphorbia chamaesula Boiss, Cent. Euphorb, 38. 1860. 
Tithymalus luridus (Engelm.) Wooton & Standley. 
Euphorbia lurida Engelm. Proc. Amer. Acad. 5: 178. 1861. 
Tithymalus mexicanus (Engelm.) Wooton & Standley. 
Euphorbia dictyosperma mewicana Engelm. in Torr. U. 8. & Mex. Bound. Bot. 
191. 1859. 
Euphorbia mexicana Norton, Rep. Mo. Bot. Gard. 11: 105. 1899, 
Zygophyllidium delicatulum Wooton & Standley, sp. nov. 
A slender annual, sparingly branched; stems erect or ascending, green, 
glabrous, sometimes purplish; leaves mostly alternate, the floral ones opposite 
or ternate, ovate to oblong, acute or obtuse, 15 to 30 mm. long, thin, bright green, 
finely serrulate, rounded to cuneate at the base; petioles slender, about as long 
as the blades; stipules mostly obsolete; flowers solitary, or clustered in the 
axils; pedicels 2 to 4 mm. long; involucres glabrous, with 5 glands; appendages 
obovate, greenish or purplish white; capsules glabrous, 4 mm. in diameter; 
seeds ovoid, terete, papillose, not carunculate. 
Type in the U. 8. National Herbarium, no. 562959, collected on Mineral Creek, 
Sierra County, at an altitude of 2,250 meters, September 26, 1904, by O. B. 
Metealfe (no. 1414). 
ADDITIONAL SPECIMENS EXAMINED: Tularosa Creek, August 18, 1899, Wooton; 
Ruidoso Creek, alt. 2,100 meters, June 30, 1895, Wooton. 
A very different plant from any of the other species of the genus, differing 
most noticeably in the width and shape of the leaf blades and the glabrous 
involucres. ‘ 
