446" IOTORSION. 



»..RAUvvoLFiA,...PERiPLOCA ) ...and Stapblia ;...and to the right in 

 Pedicularis. 



In Trientalis there is this singularity, that the petals are all 

 imbricate, one side of each folding over the next towards the 



right. 



In Gent i ana, the imbrication of the petals before they are un- 

 folded is contrary to the sun. 



The Pistilla incline to the left in Cucubalus and Silene. 



The Germina are twisted to the left in Helicteres and Ulm aria. 



Flowers, in respect to intorsion, have, 



A resupination*, which is, when the upper lip of the corolla 

 look towards the ground, and the upper lip towards heaven, as 

 in the European Vioue,...Ajuga ORiENTALis,...OcYMUM,...and 

 some species of Satyrium ; or 



An obliquity, as in the species of Hyssopus, called Lopanthus, 

 ...Nepeta SiBiRiCA,...and some species of Pedicularis. 



Spice, spikes, are, 



Spiral, as in Claytonia, and in some asperifoliousf plants ; or, 

 incurvate, crooked, as in Saururus,... Mimosa,. ..Petiveria,... Pa- 

 paver,. ..Sedum RuBRUM,...and Lilium Martagon. 



In several plants there is found a contorsion of the fibres, which 

 answers the end of an hygrometer%. 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. 



* Resupmation is, when any thing is thrown on its back, or lies face upwards. 



Editor. 



f The asperifolice belong to the class Pentandria. See Part II. Chap. VIII. 



Editor. 



X An instrument for measuring the degree of dryness or moisture of the air. The 

 fibres of the plants here instanced being affected by the quality of the air, the spi- 

 ral part twists or untwists, as the weather varies j and by observing this, the tem- 

 peratare of the air maybe discovered. Editor. 



