Stella

Plants of this collection are several decimeters taller; the pedicels are more remote in the inforescence; the stellae are larger and form a less dense cover on plant parts, and the siliques are slightly larger than in the usual form of the species.

Stems and young branches terete, viscid, densely ferruginous-tomentose with sessile to short-stalked pauciradiate stellae bearing greatly prolonged 4-6-celled midpoints, these 0.1-0.2 cm long, gland-tipped, strongly armed with ferruginous laterally compressed prickles, these broad-based and sparsely glandular in the basal quarter.

The morphological and statistic analyses are also given to the stellae structure of Olivooides and Punctatus, which indicates that this structure is a result of adaptive evolu- tion to a lifestyle of fast-attaching after hatching, probably with the function of mucilage secretion.