FRUCTIFICATION, OH FLOWER AND FRUIT. 27 



8. Arillus, the Tunic, a complete or partial co- 

 vering, attached to the base only, more or less 

 loose, or inflated, as in Urania, fig. 155, Euony- 

 mus,and the Mace of the Nutmeg. In Oxalis this 



* o 



part is elastic ; yet perhaps a more genuine Aril- 

 lus than in the true Rutacece, or the Euphorbia. 

 See Jussieu's 81st and 96th orders. 



9. Pappus, the Seed-down, a feathery, hairy, bristly, 

 or membranous tuft, or crown, at the summit 

 of a Seed, rarely at its base, most important 

 in the Compound Flowers. 



10. Cauda, a Tail, a terminal, often feathery or 

 hairy, appendage, formed of the permanent Style 



11. Rostrum, a Beak, an elongation of a Seed- 

 vessel, as in the Geranium tribe, or of a Seed, 

 as in Scandii'j fig. 2 1 0. 



12. Ala, a Wing, a dilated membranous or coria- 

 ceous expansion, terminating or surrounding a 

 Seed, or Seed-vessel, fig. 221, c. 



63. Receptaculitm, the Receptacle, the common base, 

 or point of connexion, where all the parts of a 

 Flower meet : as also the place of insertion of the 

 Seeds (62) more particularly. The Receptacle of 

 a Flower is the disk, or space between the Sta- 

 mens (58) and Pistil (59) ; especially if the Ger- 

 men be inferior. In Compound Flowers (rT8) the 

 Common Receptacle, being either naked, hairy, 

 scaly, or cellular, affords generic distinctions. , 



