ANACARDIACEiE. 157 



Plate 159, 160. 



RHUS, Tourn, 



Flores polygami, mono-dioici. Calyx 5-partitus. Petala 

 5, inter calycem et disciim pi. m. perigynum inserta. Stami- 

 na 5. Ovarium subglobosum, stylis brevibus stigmatibusve 

 obtusis 3 superatum. Ovulum ex apice funiculi filiformis 

 liberi appensum. Drupa exsucca. Cotyledones radiculaj 

 supers accumbentes. 



Rhus, Linn. Gen. 369. Lam. 111. t. 207. Gsertn. Fr. 1. t. 44. DC. 

 Prodr. 2. p. 66. Torr. & Gray, Fl. 1. p. 216. Endl. Gen. 5905. 

 Rhus, Cotinus, & Toxicodendron, Tourn. Inst. p. 610. 

 PocoPHORUM, Necker, Elem. 934. 



Sumacli. Poison Oak. Poison-Trcc. 



Flowers by abortion pol^'gamo-dicBcious or polygamo- 

 moncecious, or rarely perfect. Calyx of five sepals, united 

 at the base, equal, quincuncially imbricated in asstivation, 

 usually persistent. Disk fleshy, surrounding the base of the 

 ovary but free from it, coherent with the very base of the 

 calyx, annular or five-lobed, the lobes opposite the petals. 

 Petals 5, alternate with the sepals, equal, sessile, inserted 

 under the margin of the disk where it becomes free from the 

 calyx (perigynous), quincuncially imbricated in aestivation, 

 deciduous. Stamens 5, alternate with the petals, inserted on 

 or just under the margin of the disk : filaments subulate, 

 distinct : anthers obloqg or didymous, introrsc, two-celled, 

 the cells opening longitudinally ; in the fertile flowers usually 

 smaller and more or less imperfect. Ovary in the sterile 

 flowers abortive ; in the fertile ovoid or globular, sessile, one- 

 celled : styles 3, short, sometimes almost none : stigmas 

 terminal, obtuse, or depressed-capitate. Ovule solitary, anat- 

 ropous, resnpinale-suspendcd from the incurved apex of a 

 long filiform funiculus \vhich rises from the base of the cell ; 

 the micropyle superior. 



