Plate 2471. 



POLYGONUM (§ ACONOGON) TIBETICUM, Hemsl 



POLYGOXACE^. 



HenisI 



X. tiucLii^uiii, nemsi. [sp. nov.) ; perenne, nanum, undique dabrum, 

 caulibus erectis^ gracilibus lignescentibus pauciramosis, internodiis 

 quam folia brevioribus, stipulis amplis tenuissimis truncatis vel obli- 

 qms cito ad basin fissis, foliis brevissime petiolatis crassis vix coriaceis 

 obovato-oblongis marginibus (in siccis) recurvis venis immersis incon- 

 spicuis cymis parvis densis terminalibus brevissime pedunculatis. 

 pediceHis brevissimis, perianthii seginentis 5 valde ina^qualibus obovato- 

 spathulatis apice rotundatis stamina superantibus, staminibus 8 in- 

 ffiquilongis hypogynis, disco inter stamina et ovarium carnoso 8-lobato 

 Jo bis ovoideis, ovario glabro, stjlis brevissimis stigmatibus magnis 

 capitatis, nuce ignota. 



Hab.- Central Tibet : Gooring Valley, 30° 22' N" 90" 25' E at 

 about 16,500 feet, Sl George H. Litiledale, July and August 1895."' 



Caules 1-12 poll alti. Folia cum petiolo 1-U poll, longa. Cymce 

 (2 tantum vis*) 6-9 lin. diametro. Flores circite"r 2^ lin. diametro. 



In, foliage this species comes nearest P. tortuosvm, Don, and in floral 

 structure nearest to P. paniculatum, Blume. There are apparently 

 very few species in which there is a largely developed disc between the 

 ^amens and the ovary, as in the present species and in P. paniculatum. 

 Bnt tins character is not confined to the section Aconogon. P. chimnse 

 Linn. (§ Cephaloj^hilon), is represented with a similar disc. In the 

 genus, or section, Fayopyrum the stamens alternate with similar fleshy 

 bodies. — W. Bottixg Hemsley. 



^g- 1- Unexpanded flowers. 2. Expanded flower. 3. Perianth, stamens, and disc. 

 4. Pistil, All enlarged. 



