US AN INTRODUCTION 



In Gentiana, the imbrication of the petals before 

 they are unfolded is contrary to the sun. 



PISTILLA, incline to the left in Cucubalus and 

 Silene. 



GI.RMINA are twisted to the left in Helicteres 

 and Ulmaria. 



FLOWERS, in respect to Intorsion, have, 



A Resupination* ; which is, when the upper lip 

 of the corolla looks towards the ground, and the 

 under lip towards Heaven ; as in the European 

 Violae, Ajuga orientalis, Ocymurn, and some spe- 

 cies of Satyrium ; or, 



An Obliquity ; as in the species of Hyssopus call- 

 ed Lopanthus, Nepeta sibirica, and some species of 

 Pedicularis. 



SPJCAE, spikes, are, 



Spiral as in Claytonia, and in some Asperifoli- 

 ous plantsf; or incurvate, crooked ; as in Sa^rurus, 

 Mimosa, Petiveria, Papaver, Sedum rubrum, and 

 Lilium Martagon. 



In several plants there is found a contorsion of the 

 fibres, which answers the end of an Hygrometer J. 

 Thus in Avena, there is an Arista, or beard that is 

 twisted like a rope ; in some Geraniums, the arillus 

 of the seed has a spiral tail ; and in Mnium, the pe- 

 duncles are twisted contrary ways above and below. 



* Resnpinatiou, is when any thing is thrown on its back, 

 or lies face upwards. 



+ The Asperifoliae belong to the class Pentandria. See 

 Part 2. Chap. 8. 



J An instrument for measuring the degree of dryncss or 

 moisture of the air. The fibres of the plants here instanced 

 being affected by the quality of the air, the spiral part twists 

 or untwists as the weather varies; and by observing this, the 

 dry ness or moisture of the air may be discovered. 



