410 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
1. Forsellesia spinescens (A. Gray) Greene, Erythea 1: 206. 1893. 
Glossopetalon spinescens A. Gray, Pl. Wright. 2: 29. pl. 12. 1853. 
Type Locauity: ‘In a mountain ravine near Frontera,’ Texas. The type came 
from within a few miles of the southern boundary of New Mexico. It may even have 
come from the south end of the Organ Mountains. 
Rance: Washington and California to Colorado and western Texas. 
New Mexico: Upper Corner Monument; San Andreas Mountains; Llano Estacado; 
Organ Mountains. Dry hills, in the Upper Sonoran Zone. 
A rare shrub of dry rocky slopes, mostly on limestone soil. 
2. PACHISTIMA Raf. 
Prostrate evergreen shrub with glabrous opposite short-petioled serrulate leaves; 
flowers solitary or in few-flowered axillary cymes; calyx 4-lobed, with a short tube; 
petals 4; ovary 2-celled; capsule small, 1 or 2-seeded. 
1. Pachistima myrsinites (Pursh) Raf. Fl. Tellur. 42. 1838. 
Ilex ? myrsinites Pursh, Fl. Amer. Sept. 119. 1814. 
Type Locauity: ‘On the Rocky Mountains and near the Pacific Ocean.” 
RanaGe: British Columbia and California to New Mexico. 
New Mexico: Zuni Mountains; Carrizo Mountains; Sandia Mountains; Bear Moun- 
tains; Cloudcroft; Mogollon Road; Tunitcha Mountains; Chama; Lookout Mines; 
Santa Fe Canyon. Woods, in the Transition and Canadian zones, 
3. MORTONIA A. Gray. 
A low shrub; leaves elliptic, thick, entire, acute, contracted into a very short petiole, 
crowded, 1 cm. long or less; stems yellowish like the leaves; flowers in short terminal 
bracteate racemes; whole plant densely scurfy. 
1. Mortonia scabrella A. Gray, Pl. Wright. 2: 28. 1853. 
Tyre Locauity: ‘‘Mountain-sides, near the San Pedro, Sonora,’’ and ‘‘Mountains 
near El Paso.” 
Rance: Western Texas and southern Arizona, south into Mexico. 
New Mexico: Upper Corner Monument ( Mearns 64, 247). Dry hills, in the Lower 
Sonoran Zone. 
85. ACERACEAE. Maple Family. 
Small or large trees with smooth exfoliating bark; leaves opposite, simple and pal- 
mately lobed or pinnately compound; flowers polygamous or dicecious, in axillary 
racemes or corymbs; sepals 4 or 5; petals as many or mostly wanting; stamens as many 
as the sepals, rarely 8, inserted on a disk, or the disk wanting; pistil of 2 or more united 
carpels, becoming 2 laterally winged samaras. 
KEY TO THE GENERA, 
Leaves simple or palmately 3-foliolate; young branches red- 
dish or gray; flowers polygamous. we eeeeeeeeeeeee-s-.-- 1. ACER (p. 410). 
Leaves pinnately 3 or 5- foliolate; young branches green; flow- 
ers dicecious............ wee eee eee eect eee eens 2. Nea@unpo (p. 411). 
1. ACER L. Mapte. 
Trees with reddish, brownish, or grayish twigs, rather smooth bark, and palmately 
5-lobed or 3-foliolate leaves; flowers polygamous, preceding the leaves, inconspicuous, 
on slender pendent pedicels; petals sometimes present; fruit as described for the 
family. 
