54 USEFUL PLANTS OF GUAM. 
shrub with a dense habit of growth, small sessile leaves, and axillary 
flowers with 6-parted perianths. On the windward side of the island, 
and near the southern end on the leeward side, growing in the sandy 
beach at the very margin of the sea are groves of Casuarina equiseti- 
Jolia (Pl. XLI), trees with tufts of linear, leafless, jointed branches 
resembling horsetails (Kquisetum) and cone-like fruit. Among other 
beach plants are the composites Stemmodontia biflora, S. canescens, 
Kelipta alba, the recently introduced Synedrella nodiflora, and the 
bidens-like Glossogyne tenuifolia; and in places there are mounds 
formed by Sesuwtum portulacastruin, the ‘‘ sea purslane,” often asso- 
ciated with creeping grasses. Coconuts are abundant on the west 
coast of the island (PI. 1), but almost absent from the east coast. 
THE INNER BEACH, 
The principal trees forming the inner beach growth are Barring- 
tonia speciosa, Barringtonia racemosa, Terminalia catappa, Heritiera 
littoralis, Pariti tiliaceum, Thespesia populnea, Ochrosia mariannensis, 
Hernandia peltata, Artocarpus communis, Calophyllum inophyllun, 
and Morinda citrifolia. Beneath their shade grow the white-flowered 
amaryllis (Crinum astaticum), the grasses, Stenotaphrum subulatum and 
Centotheca lappacea, and the shrubby Boerhaavia diffusa, Vitex trifolia, 
and Methomia umbellata. Climbing on the trunks of trees are a num- 
ber of ferns, including Phymatodes phymatodes (P|. LX11), with leath- 
ery lobed fronds, Cyclophorus adnascens, with small, linear-lanceolate, 
simple fronds, Davallia solida, with beautiful, glossy, divided fronds, 
and //umata heterophylla, with fertile fronds differing from the sterile 
in shape (PI. LIII). In addition to the above-mentioned species there 
are a number of shrubs growing in the vicinity of the beach—the 
beach plum (X7menta americana), Clerodendron inermis, with white, 
honeysuckle-like flowers and exserted pink stamens; Acacia farne- 
stana, with globular, yellow heads of fragrant flowers; Leucaena glauca, 
with similar heads of white, inodorous flowers; and the custard apple, 
Annona reticulata, the only species of this genus which grows sponta- 
neously on the island. Twining among these shrubs are several 
species of Convolvulaceae, including Zpomoca choisiana and [. marian- 
nensis, With purple flowers; the lavender-flowered ‘‘alilag” (Argyreta 
tiliaefolia), the flowers of which, called ‘‘abubo,” are strung into gar- 
lands by the children; and Opereulina peltata, which has white flowers. 
THE CLIFFS. 
On the promontory of Orote on the west coast, that of Kiroga on 
the east near Taloféf6 Bay, on the rocky island of Cabras, or Apapi, 
and on the edges of cliffs are usually found the following plants: Cor- 
migonus mariannensis, a shrub or small tree belonging to the Rubi- 
aceae, with large, white, four-parted, trumpet-shaped flowers; Cycas 
