What is the fine-grained topic of the following text: One species in genus, a shrub, native to the Solomon Islands; stems flat, articulated, striate, usually leafless in flowering stage; leaves lanceolate, 0.5 to 2.5 inches long, often lobed at the base; flowers small, greenish, in little petiole or a stigma, when the style is absent. Only return the topic.
Description of a specific shrub species native to the Solomon Islands