42 Addisonia 



shoots. The flower-shoots are about one foot long and from three 

 to five in number, arranged in a single rank at the point of origin. 

 These flower-shoots, produced at the summit of the leafy stems, 

 are clasped at the base by a conduplicate sheath or spathe. The 

 peduncle is rigid, slightly arching, for the most part scurfy-pu- 

 bescent, with several green, broadly ovate, acute bracts below the 

 raceme. The raceme is many-flowered, six inches or more long, 

 elongating during anthesis, the lowermost flowers turning brownish 

 or black and then dropping off while the terminal ones are still 

 crowded together to form a cushion of tiny green buds. The 

 flowers are yellowish, sparsely spotted with crimson magenta, 

 emitting an odor suggestive of linseed oil, three eighths of an inch 

 across between the tips of the lateral sepals. The pedicel and 

 ovary are together about one quarter of an inch long, densely 

 clothed with a whitish covering of stellate trichomes which extend 

 to the lateral sepals. The lateral sepals are ovate-lanceolate, 

 spreading and with the foot of the column forming a distinct 

 mentum; the upper sepal is directed forward over the column, 

 considerably narrower than the laterals and strongly concave. 

 The petals are oblong-spatulate, obtuse, rarely, or only sparingly, 

 spotted with magenta crimson, much smaller and more membran- 

 aceous than the sepals. The labellum is a remarkable organ and 

 extremely complex in structure; it is joined to the foot of the 

 column and in outline is distinctly three-lobed; the lateral lobes 

 obliquely ascending, semi-ovate, obtuse, with six or more crimson 

 magenta spots; the middle lobe transversely oblong or subquadrate 

 with a deflexed apicule; the disc bilamellate, each lamella extending 

 almost to the sinus formed by one of the lateral lobes with the 

 middle lobe ; in addition to the lamellae there is a median keel that 

 terminates in a thickened process at the base of the middle lobe; 

 there are four calluses on the disc, the largest one trigonous in 

 shape and situated near the centre of the middle lobe, the remaining 

 ones at the base of the labellum, the largest being linguiform, its 

 tip curved toward the column ; on each side of this callus the others 

 arise as shorter papiliform emergences; these three basal calluses 

 are deep magenta crimson, but like the terminal one are concealed 

 by a dense mass of yellow, mealy granules. The column is fleshy, 

 suffused with magenta, dilated upwards, but without wings or 

 appendages. The pollen-masses are complanate-pyriform, four 

 in each anther-cell. 



Oakes Ames. 



Explanation op Plate. Fig. 1. — Terminal portion of a flowering stem, 

 much reduced. Fig. 2.— Raceme. Fig. 3.— Flower, X 3. Fig. 4.— Flower, 

 with lateral sepals and petals removed, X 3. Fig. 5. — Anther, X 4. Fig. 6. — 

 Pollen-masses, X 4. Fig. 7. — Leaf. 



