Streptanthus fenestratus not subdivided. Flowers occur at intervals along the upper stem with one or two leaflike green or purple-tipped bracts at the base of the raceme. Each flower has a tubular urn-shaped calyx of purple sepals just under a centimeter long. Light petals up to 1.5 centimeters long emerge from the tip of the calyx. The fruit is a flat, narrow silique up to 5 centimeters long. One of the main threats to this species is trampling by hikers. Streptanthus fenestratus Streptanthus fenestratus is an uncommon species of flowering plant in the mustard family known by the common name Tehipite Valley
Calyx of Held embryonic calyx formation. One characteristic that distinguishes Eph proteins and their receptors from other signaling systems is their ability to transmit information bidirectionally. Forward and reverse signaling in VCN and MNTB cells is essential for the proper number and formation of VCN and ipsilateral MNTB projections in the calyx. Eph proteins also ensure that while axons pass through the ipsilateral MNTB, branching and final termination of these projections only occur in the contralateral MNTB, possibly because the proteins are only targeted towards specific regions on the axons. Overall, there are two ultrastructural changes that occur in the calyx of Held.