Page:The Journal of Indian Botany.djvu/254

216 ation showed a sensitiveness to drought. The leaves took on a purplish-red tinge while even the corolla had many fine streaks of the same colour, doubtless due to anthocyanin pigments."

The corolla length was found to be very variable with reference to the calyx length. No measurements were made.

'''IV. S. orobanchoides''':— This is a well marked holoparasitic species in which the writer has noted no striking variations. It is net common in ordinary grasslands, the few specimens that the writer has seen being from a forest reserve en a hillside near Poona.

The Scrophulariacece is an order with apparently a history of variation, if one may judge :by the sub-orders, classes and genera into which it is divided. Striga itself provides what is apparently a recent mutant. Strigina, described by Engler differing from Striga in having the two anterior stamens reduced to staminodes. The question arises : Are the two colour forms of S. lutea and the plants with different sizes and shapes of corolla in S. densiflora to be put in different species? The only answer to this question can be got by growing the plants in pure culture, and up to date the writer has not succeeded in germinating Striga seed either by itself or in contact with host roots.