404 USEFUL PLANTS OF GUAM. 
olate, acuminate, produced below into an acuminate appendage, rachis of the 
leaflets 8 to 12 mm, long, leaflets very shortly stalked, linear-lanceolate or lance- 
olate, acute, often unequal-sided, glabrous, rigid, dotted with black glands beneath; 
bracts inclosing the flowers ovate, acute, reticulate-veined, leaf-like, persistent, 
often ciliate, dotted like the leaves, arranged in stiff, erect, very lax axillary spikes; 
flowers with minute calyx having the upper segments connate, the petals exserted, 
and the stamens monadelphous; pod jointed, easily separable into flattened, inde- 
hiscent 1-seeded joints, either quite inclosed between the bracts or slightly exceed- 
ing them; surface of the joints set with numerous short, straight spines. 
A common weed growing in waste places and on the sites of abandoned clearings. 
REFERENCES: 
Zornia diphylla (L.) Pers. Syn. 2: 318. 1807. 
Hedysarum diphyllum L. Sp. Pl. 2: 747. 1753. 
Zostera tridentata Solms. Same as Halodule uninervis. 
Zygomenes cristata. CRESTED SPIDERWORT. 
Family Commelinaceae. 
A common weed growing in open places, with 3-petaled flowers in terminal scor- 
ploid, bracteate cymes, inclosed in large falcate, imbricating, 2-seriate bracteoles. 
Stem creeping below, branches ascending; leaves ovate-oblong, subacute; the petals 
and stamens alone are exserted beyond the bracteoles; sepals 8; corolla with a 
funnel-shaped tube and a spreading, equally 3-lobed limb; stamens 6, bearded; 
ovary 3-celled; cells usually 2-seeded; style thickened at tip; seeds striate and pitted. 
A plant widely spread in the Tropics. 
REFERENCES: 
Zygomenes cristata (L.) 
Commelina cristata L. Sp. Pl. 1: 42. 1753. 
Cyanotis cristata (L.) D. Don, Prod. Fl. Nep. 46. 1825. 
Tradescantia cristata L. Syst. ed. 12, 233. 1767. 
Salisbury’s name, Zygomenes is thirteen years earlier than Don’s publication of 
Cyanotis. 
