CASUARINACEAE. 59 



28. ONCIDIUM Sw. Epiphytic or Konietinies terrestrial herbs, with 

 pseudobulbs. Leaves with broad or narrow aud elongate blades, terminating 

 the pseudobulb from the base of which arises the llower-stem. Flowers in a 

 raceme or panicle. Perianth often mottled. Lateral sepals slightly inequi- 

 lateral, leflexed or spreading. Petals often similar to the sepals. Lip crested, 

 clawless or short-clawed, 3-lobed, the middle lobe larger than the lateral ones. 



Epiphytic : middle lobe of the lip 20-24 mm. wide : leaf-blades not elongate 



1. O. iiiiiliiliitiiiii. 

 Terrestrial: middle lolie of the lip 11-14 mm. wide: leaf-blades 



elongate. 2. O. sphacelatum. 



1. O. undulatum (Sw.) Salisb. Pseudobulbs 1-2 cm. long: leaf-blades 

 oblong, elliptic, or oblong-lanceolate, 3-6 dm. long: flower-stem, 12-19 dm. 

 long: lateral sepals 16-19 mm. long, the blade oval or obovate, crisped: petals 

 15-18 mm. long, the blade obovate to cuueate: lip 18-20 mm. long, the middle 

 lobe 20-2i itmi. wide. — Hammocks. — (Cuba, Ant.) 



2. O. sphacelatum Lindl. Pseudobulbs 8-11 cm. long: leaf -blades linear, 

 3-9.5 dm. long: flower-stem 9-21 dm. long: lateral sepals 15-16 mm. long, the 

 blade oblong-lanceolate: petals 14-15 mm. long, the blade ovate-lanceolate: 

 lip 13-15 cm. long, the middle lobe 11-14 mm. wide. — Pinelands aud ham- 

 mocks. — (Ball., Cuba.) 



Subclass 2. DICOTYLEDONES. 



Stems consisting of pith, wood, and bark (endogenous in rare 

 cases). Early leaves opposite. 



Series 1. CHORIPETALAE. 



Petals separate aud distinct from, each other, or wanting. 



Order CASUARINALES. 



Shrubs or trees, with loosely jointed branches resembling stems of 

 Equisetum. Leaves reduced to scales, whorled at the nodes and decurrent 

 on the internodes. Flowers monoecious, the staminate in slender terminal 

 spikes with imbricate bracts, often with a posterior and anterior iDcrianth- 

 part, 1 stamen with a large anther. Pistillate flowers in dense spikes or 

 cones: perianth wanting: ovary 1-ceIled : style-branches slender. Fruit an 

 aggregate of winged aehenes. 



Family 1. CASUARINACEAE. Beefwood Faiiilt. 



Stems with more or less whorled branches. Staminate spikes long- 

 stalked. Pistillate spikes short-stalked. Gynoecium 2-carpellaiw. 



1. CASUARINA Adans. Stem clothed with a smooth or smoothish bark, 

 except when very old. Stamens with long filaments and short anthers. 

 Stigmas elongate. Fruiting spike compact. 



1. C. equisetifolia Forst. A tree often 10 m. tall, with many slender branches: 

 leaves (scales) 1-3 mm. long, 6-8 in each whorl: staminate spikes 1-4 cm. 

 long: pistillate spikes globular, becoming 1-2 cm. in diameter in fruit: seed- 

 wing nearly thrice as long as the body. — Cultivated grounds and waste places. 



