238 Mr. D. Don's Descriptions of new Genera and Species 



become confluent. They occupy the centre of the laciniae, and, 

 unlike the other plants of this family, there are no vessels ter- 

 minating in, or branching off from the sinus. 



Tylloma. 



Involucrum imbricatum. Flosculi marginales unilabiati ! Pappus 

 capillaris : radiis simplici ordine dispositis. 



Involucrum ovatum, polyphyllum, multiplici ordine imbricatum: 

 squamis integerrimis, mucronulatis, Iambus, coriaceis, ad- 

 pressis ; interioribus oblongis, apice coloratis. Receptacu- 

 lum nudum. Flosculi marginales pauci, foeminei, unila- 

 biati, vix radiati, obtuse tridentati ; disci hermaphroditi, 

 tubulosi, extus sericeo-villosi, limbo bilabiati : labiis abbre- 

 viatis ; exteriore obtus^ tridentato ; interiore bifido, lobis 

 lanceolatis, acutis, erectis. Stamina tubo infra medium in- 

 serta : jilamenta angusta, complanata, glabra, apice atte- 

 nuata : anthera in tubum coalitse, basi bisetre : setis longis, 

 ramulosis, subplumosis : appendicula terminalis lanceolato- 

 linearis, acuminata, cartilaginea, anthera ipsa brevior. 

 Stylus filiformis, glaber. Stigma clavatum, bilobum : lobis 

 abbreviatis, conniventibus, crassis, obtusis, pruinosis, mar- 

 gine incrassatis. Achenia trigona, papilloso-muricata. Pap- 

 pus capillaris, deciduus : radiis simplici ordine contignis, 

 subaequalibus, basi apiceque puberulis. 



Herba multicaulis, lanugine laxd parcius instructa. Radix ramosa, 

 annua. Cauclex brevissimus. Caules procumbentes, ci/lin- 

 dracei, purpurascentes, 2 — ^-unciales. Folia alterna, subses- 

 silia, in apice ramulorum aggregata, eaten) m sparsa, cuneato- 

 lanceolata, limbata, integerrima, complicata, Jlexnosa, valde 

 coriacea, colore glauco carulcscentia, utrinque glandulis ma- 

 jusculis, pedicellatis, sparsis munita, subtus costd validd basi 

 valde dilatatd, hinc carinata, semuncialia ; juniora pracipue 



supra 



