Information respecting Botanical Travellers* 139 Diplacus * longijlora, suffruticosa viscosa pubescens ; foliis lineari-lanceo-latis utrinque attenuates, vix serrulatis, margine vevolutis, supra gla-bris; pedunculis brevissimis, calycibus villosis, laciniis vix inaequalibus acutis ; corollae lobis latissimis, oblique emarginatis. Hab. In rocky places by small streams, in the vicinity of Sta. Barbara (Upper California). A species remarkable for the width and very oblique emargination of the lobes of the corolla, which is of a paler yellow than in any other species, and inclining to a fawn colour. The stems are very leafy, pubescent, and the leaves elongated and acuminate. The base of the calyx is also almost lanuginous. Flowering in April. Thomas Nuttall. Philadelphia, October 12, 1837. XV. — Information respecting Botanical Travellers. Mr. Tweedie's Journal of an Excursion from Buenos Ayres to the Serras de Tandil. (In a Letter communicated by the Author 12th April, 1837.) On the above day I set out on a botanizing excursion to the Ser-ras de Tandil, a dry ridge of rocky hills, or rather stony heaps, about 300 miles to the south of this city. My excursion would have been made earlier in the season, but domestic affairs prevented me. Mid-day being come before we started, we were able to travel only about sixteen miles, through a country intersected with wretched roads ; for there being no material for making roads in this country, every one seeks the best way he can through the flat plains. The first thing which interested us was the sticking fast in a bog of one cart out of six belonging to my guide, a Mr. Methuen of Perth. The peons dug a track for the wheels, whilst eight pair of bullocks were employed to drag it out. After looking at their awkward work, we left them, and proceeded on our journey ; and in the afternoon passed some large and beautiful groves of peach and Carolina poplars, the only sort of wood grown in this country. The peach plantations attain the height of from ten to twenty feet in three years, and are then cut down for fire wood. The poplars remain and soon become fine trees : these plantations last for forty years, treated as osiers are in England. At night we halted at the house of a Mr. Roger, who left Killwin-
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