50 
3. GUIACUM Plum. (LIGNUM-VIT# TREE.) 
Trees or shrubs, with very hard wood, alternate commonly knotty 
branches, opposite abruptly pinnate leaves with several pairs of coria- 
ceous entire reticulate-veined smooth and shining leaflets, terminal 
peduncles with one or several rather large blue or purplish flowers, 5 
deciduous sepals and petals, 10 stamens with naked filaments, and a 
smooth strongly 2 to 5-angled fruit. 
1. G. angustifolium Engelm. A straggling shrub (on bluffs) or a small tree (in 
valleys), with very smooth branches and leaves: leaflets 8 to 16-reticulated : purple 
flowers 12 mm. in diameter: ovary 2-celled, forming an obcordate 2-lobed pod, with 
2 yellow seeds as large as small beans. (Porliera angustifolia Gray.)—From the lower 
Rio Grande to the Colorado, and west to the Pecos and more sparingly beyond. 
Called ‘‘ guayacan,” and of considerable repute in various diseases. 
GERANIACEH. (GERANIUM FAMILY.) 
A family of such diverse habit and structure as to be very difficult 
of definition, but ours are mostly herbs, with toothed, lobed, or com- 
pound leaves with or without stipules, regular 5-merous flowers on 
axillary peduncles, 5 or 10 stamens, ard a 5-lobed and 5-celled ovary 
with a central axis. 
*Carpels 1-seeded, separating elastically from the long-beaked central axis from 
below upwards, the styles forming long tails which become revolute upwards or 
spirally twisted : stipules present. 
1. Geranium. Fertile stamens 10: tails of the carpels not bearded. 
2. Hrodium. Fertile stamens 5: tails of the carpels bearded inside. 
**Carpels combined into a 5-celled few to many-seeded loculicidal pod: stipules 
rare. 
3. Oxalis. Sepals, petals, and styles 5: stamens 10: leaves mostly compound with 
leaflets entire or notched at the end. 
1. GERANIUM L. (CRANESBILL.) 
Annual or perennial herbs, with palmately lobed and mostly opposite 
leaves, scarious stipules, axillary peduncles bearing 1 to 3 violet or 
rose-colored or white flowers, and stamens and carpels as already given. 
1. G. czespitosum James. Perennial from a stout caudex, more or less decum- 
bent spreading and cespitose, canescent but not glandular: leaves round-reniform, 
3-parted with cuneate divisions, the lower once or, especially on the radical leaves, 
twice cleft on the lower side: sepals long-pointed: petals purple or white, 8 to 12 
mm. long, villous within: filaments a third longer than the pistil: carpels more or 
less villous: seeds reticulate.—In the mountains west of the Pecos. 
9, G. Carolinianum L. Annual or biennial, stout-stemmed, spreading when large, . 
loosely gray-pubescent and mostly dirty-glandular: leaves incisely 3 to 5-parted, the 
cuneate divisions more or less deeply cut-toothed or dissected into linear lobes: 
peduncles and pedicels short, often densely crowded: sepals ovate, tapering to a 
prominent awn: petals rose-colored, about equaling the calyx: carpels villous-his- 
pid: seed oblong and low-reticulate.—Throughout Texas, where it is associated with 
var. TEXANUM Trelease, in which the seeds are round and deeply pitted.—Collected 
near New Braunfels by Lindheimer in 184, 
