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- 



