CXXXIV. POLYGONACE^. 89 



nalibus deliiscentibus. Discus annularis s£epe adest ad basin perianthii, integer v. crenis 

 V, dentibus tot quot stamina iisque alternis instructus. Ovarium superum, sessile 

 V. rarius basi breviter perianthio adnatum^ 3-gonnm v. compressunij rarissime 4-gonum, 

 1-locnlare. Styli 3, 2 v. rarissime 4, ad apicem ovarii distincti v. basi connati, nunc 

 brevissimi; apice in stigmata capitata peltata v. varie expansa v. fimbriata dilatati. 

 Ovulum unicnm, orthotropum, sessile v. ad apicem funiculi plus minus elongati erectum, 

 V. funiculo apice recurvo pendulum, Frnctus nuceus, indehiscens, 3-gonu.s compressus 

 V. rarius 4-gonus, perianthio immutato v. varie aucto inclusus velatus v. vestitus, rarius 

 e perianthio marcescente exsertus ; pericarpium crustaceum v. rarius coriaceum v. indu- 

 ratura. Semen jn loculo erectum, sessile v. breviter stipitatum, pericarpio conforme nisi 

 minus angulatum, interdum sulcis longitudinalibus profundis 3-G-lobum ; testa mem- 

 branacea ; albumen copiosmUj farinosum, semen implens, ;equabile v. rununatum. 

 Embryo ssepius plus minus excentricus v. lateralis, varie curvus v. rectus interdum 

 peripliericus ; cotyledones planiusculiBj angustaj v. latie, rarius latissimaj convolutjeque ; 

 radicula longa v. brevis, supera v. ascendens. 



Herbae frutices v, interdum arbores. Folia altema v. rarius opposita, forma varia, 

 rarius lobata v. divisa nee unquam composita, petiolo seepius basi plus minus dilatato 

 amplexicauli, ibidemque ssepe membranaceo-marginato, margine cum ocrea stipulina 

 membranaceo-scariosa intrapetiolari caulem vaginantem continuo, folio delapso cicatricem 

 annularem s?epius relinquente. Flores siepius parvuli, intra bracteam cupulatam ocrei- 

 formem v. apertam v. involucrum 4-G-fidum solitarii v. ssepius fasciculati, fasciculis 



axillaribus v. in dichotomiis caulia v. secus rhachin spicte v. racemi dispositis. Pedicelli 

 sa3pissime articulati. 



Species ad 600, per orbem fere totum dispersse, arborescentes fere omnes Americse tropicas incolse, 

 herbacese in regionibus temperatis v. montanis frequentiores, fruticosse plurimae atl rcgionem 

 ori en tali -Mediterranean! v. Asiam oecidentalem limitatse. 



Ordo distinctissinius, a CEBteris Curvembryis facillimc dignoseitur habitu, ocreis, perianthio, 

 staminum situ, ovulo orthotropo, radicula supera, aliisque uotis, et uulli alii ordiui arete appro- 

 ximatur. 



FOnUJE AliX0Ii:UES. 



Folia opposita v. verticillata in specicbus pauci^s Eriogoni, hi Lastarritca, Choricauthc, Pterostegia 

 et interdum in K<xnigia. 



Stamina nunicrosa in CalUgono et Sgoimcrla, diaeo cenLrali nee periantliio affixa in floribus <J 

 Raprechtiie ct Symuieri(S. 



Pibtillum 4-merum in CalUgono. 



Ovulum funiculo sunimo apice recurvo pendulum in Antlgono, Brunnichla et Leptogono. Funi- 

 culus pariter elongatus sed ovulum erectum in specicbus pluribus Polggoni aliisque nonnullis. 



Perianthii fructiferi tubus supra nucem pcrfecte clansus v. solidus in OxggonOy Emice et Symmeria, 

 carnosus V. bacciformis in Coccoloho, Mueklcnbcckla et in Polggonl specicbus paucis o sectionibus 

 Cephaloiihilo et Aconogono, nuci adnatus in specicbus pluribus Coccolobi. 



CONSPECTUS GENERUM. 



Trlbus Z. Eriog:oue8e. Herbse suffruticesve, foliis radicalibus v. infra infloreseentzam paucis, 

 petiolo basi parum dilatato, ocrea nulla. Infiorescentia dichotome v. umbellatim ramosa, foliis 

 floralibus seu bracteis sub ramis in unam 3-fidam connatis v. 3-ao-liberis. Involucrum tubulosum 

 V. cupulatum, 4-8-dentatum v. lobatum, flores l-co-includens. Flores ssepius 6-meri 9-andri. 

 Genera omnia Americana. 



1. Ekiogonum. Involucra 3-8-dentata, oo-flora, floribus saepissime exserti?. — Amcr. hor.j 

 Mexico. 



2. OxYTHECA. Involucra 4-fida, lobis aristatis, paneiflora, floribus ssepius inclusis. — Cali- 

 fornia, Chili. 



3. CENTitosTEGiA. luvolucra tubulosa, 3-6-dcntata, extus divarlcato-calcarata, 2-4-flora. 



California. 



A. Chorizanthb. Involucra tubulosa v. infundibularia, 2-6-dentata, constanter 1-flora.— 

 California, Chili. 



