720 LXX. UMBELLIFEKJ3. (0. B. Clarke.) [Psammogeton. 



and Cabul. Very unlike the type, but there are intermediate forms. Probably 

 P. brevisetum and setifolium, Boiss. Fl. Orient, ii. 1079, are other varieties. 



DOUBTFUL UMBEIXIFER.E. 



SISON TRiNERVE, Ham. in Don Prodr. 184 ; DC. Prodr, iv. 111. 

 ATHAMANTHA GIGANTEA, Don Prodr. 184; DC. Prodr. iv. 156. 

 ATHAMANTHA TERES, Don Prodr. 185; DC. Prodr. iv. 156. 



LIGUSTICUM ?NEPAXENSE, Don Prodr. 125; DC. Prodr. iv. 159. '(An Hymeno- 

 l%na?DC. I.e.) 



ORDER LXXI. ARAZiXACEJE. (By C. B. Clarke.) 



Trees or shrubs, very rarely herbs, sometimes scandent or scandent when 

 young and finally self-supporting, not rarely prickly. Leaves alternate, the 

 uppermost rarely sub-opposite, long-petioled, large, simple or compound ; 

 stipules adnate to the petiole, sometimes inconspicuous or 0. Floivers regular, 

 small, sometimes polygamous, in umbels- racemes or panicled heads; bracts 

 and bracteoles small or conspicuous ; pedicels continuous with the base of 

 the calyx or there jointed. Calyx-tube adnate to the ovary; limb* truncate, 

 obsolete or with small teeth. Petals 5 rarely 6-7 or many, valvate or sub- 

 imbricate, expanding or deciduous in a cap. Stamens as many as and alternate 

 with the petals (very many in Ttqndtmtkus), inserted round an epigynous^jiisc. 

 Ovary inferior, 2-celled, or cells as many as the stamens (in ArthrophyUum 

 1-celled) ; styles as many as the cells, distinct or united ; ovules solitary and 

 pendulous in each cell. Fruit coriaceous or drupaceous usually small, one or 

 more cells sometimes suppressed. Seed pendulous, albumen uniform or rumi- 

 nated ; embryo minute, radicle next the hilum. DISTRIB. Species 3^0, chiefly 

 tropical and subtropical, a few in the cool temperate zones. 



SECT. I. Aralieae. Petals imbricated (hut only lightly). Pedicels jointed. 



Styles 2-5, free. Leaves compound 1. ARALIA, 



Styles 5, combined 2. PENTAPANAX. 



Styles 4-3, free. Leaves pinnatifid 3. ARALIDIUM. 



SECT. II. Pan ace oc. Petals valvate. Albumen uniform. 

 * Ovary 2-celled. 



Pedicels jointed. Leaves decompound S.*PANAX. 



Pedicels continuous. Leaves digitate . . . . ; . . . 4. ACANTHOPANAX. 



** Ovary 4r-10-celled. 



t Umbels sessile on the back of the leaf. 

 Leaves simple 5. HELWINGIA. 



tt Pedicels jointed. 

 Leaves once pinnate 6. POLTSCIAS. 



f tt Pedicels continuous. Leaves not pinnate. 



Fruit angular the size of a pea 7. HEPTAPLEURUM. 



Fruit more than in. long 8. TREVESIA. 



Flower sessile embraced by 4 bracteoles 9. BRASSAIA. 



Leaves simple (except the lowermost) 10. DENDROPANAX. 



