OECHLDACEAE 317 



1. Carteria corallicola Small. Steins 2-3.5 dm. tall: basal leaves 2-7 cm. long; 

 blades nearly linear, narrowed at both ends: flowers erect: lateral sepals linear- 

 lanceolate to broadly linear, 6.5-7.5 mm. long: lip oval to orbicular-oval, 6-7 mm. 

 long, the middle lobe much larger than the lateral ones: capsules not seen mature. 



In pine lands, near Homestead, Florida. Also in the Bahamas. 



14. ISOTRIA Eaf. 



Scapose herbs, with elongated roots. Leaves reduced to scales at the base of the 

 scape. Scape topped by a whorl of spreading leaf -like bracts. Flowers solitary or 2 

 together. Perianth purple or greenish. Sepals nearly equal, much longer than the 

 petals. Petals broader than the sepals. Lip 3-lobed at the apex, sessile, crested along 

 the middle. Capsule erect. 



1. Isotria verticillata (Willd.) Eaf. Scapes 2-4.5 dm. tall: blades of the 

 whorled bracts mainly elliptic to oval or obovate, 2.5-8 cm. long: lateral sepals 

 narrowly linear, 30-50 mm. long: petals linear, 15-20 mm. long: lip-body 10-15 mm. 

 long, terminating in 2 lateral lobes and a median broad lobe: capsule 2-3 mm. long. 



In woods, Ontario to Wisconsin, Florida and Alabama. Spring. 



15. ARETHUSA L. 



Scapose herbs, with corms. Leaves elongated sheathing scales, the upper one 

 sometimes with a narrow blade. Flower usually solitary at the top of the scape. 

 Perianth rose-purple. Lateral sepals slightly curved. Petals quite similar to the 

 lateral sepals, but shorter. Lip dilated, recurved, crested. Capsule erect. 



1. Arethusa bulbosa L. Basal leaf with a linear blade 10-15 cm. long: scape 

 1-3 dm. tall : lateral sepals broadly linear to narrowly oblong, 35-43 mm. long, acute : 

 lip 25-30 mm. long, with 2 shallow lateral lobes and a larger middle lobe, toothed or 

 fringed at the apex: capsule 20-25 mm. long. 



In bogs, Newfoundland to Minnesota, Indiana, and in the mountains to North Carolina. 

 Spring. 



16. VANILLA Sw. 



Vines with rope-like stems and aerial roots. Leaves remote, often much reduced. 

 Flowers in axillary clusters. Perianth mainly pale, but showy. Lateral sepals nar- 

 row, slightly broadened upward. Petals slightly shorter than the sepals. Lip cornu- 

 copia-like, involute and adnate to the long column, the free dilated tip fringed or 

 crisped. Capsule elongated. 



Leaves obsolete, or scale-like, recurved at the tip : capsules short. 



Lip notched at the apex: leaves obsolete. 1. V". articulata. 



Lip abruptly pointed at the apex: leav s mere narrow scales. 2. V. Eggersii. 

 Leaves with blades, not recurved: capsules elongated. 



Lip crisped, less than 35 mm. long: sepals and petals over 70 mm. long. 3. V. phaeantha. 



Lip fringed, over 40 mm. long: sepals and petals less than 60 mm. long. 4. V. planifolia. 



1. Vanilla articulata Northrop. Stem and branches very stout : leaves obsolete : 

 lateral sepals narrowly oblong,. 28^-33 mm. long: petals oblong-spatulate : lip 28-32 

 mm. long, the edge undulate-crisped: capsules 7-9 cm. long, stout-clavate. 



On hammock islands, south of Homestead, Florida. Also in the Bahamas. 



2. Vanilla Egg6rsii Eolfe. Leaves remote, scale-like linear to lanceolate, 57 

 cm. long: lateral sepals spatulate, 33-36 mm. long: petals narrowly spatulate: lip 

 30-36 mm. long, the edge crisped: capsules 5-7 cm. long, slender-clavate. 



In hammocks, south of Miami, Florida. Also in the West Indies. 



3. Vanilla phaeantha Eeichenb. f. Leaf -blades narrowly oblong to oblong- 

 lanceolate, 9-15 cm. long: lateral sepals nearly linear, slightly narrowed to the base 

 and the apex, 65-8'0 mm. long: petals rather narrower than the lateral sepals: lip 

 70^80 mm. long, the edge crenulate. 



In hammocks, southern peninsular Florida. Also in the West Indies. 



