SYNGENESIA. 



(37) 



SYNGENESIA. 



CLASS XIX. SYNGENESIA. 



Consisting of Plants whose Flowers are compound, that is, 

 composed of a number of small Flowers, or Florets, all 

 placed upon the same Receptacle, and within one common 

 Calix; the Stamens being live in number, with distinct 

 Filaments, but the Anthers, or superior part of the Sta- 

 mens, united side by side, composing a hollow cylinder, 

 through which the Style of the Pistil passes. 



1. POLYGAMIA jEQUALIS. 



(In this Order, all the flowers are furnished with both stamens 

 and pistils. 



1. Such as have ligulatc compound Flowers. 

 GEROPOGON, Old Man's Beard Callx simple; receptacle 



with bristle-shaped chaps ; seed of the disk with a 



feathered down, of the ray with five awns. 

 TRAGOPOGON, Gout's Beard Calix simple; down feathered; 



receptacle naked. 

 SCORZONERA, Viper's Grass Calix imbricate with scales, 



scariose at the edge ; pappus feathered, sessile ; receptacle 



naked. 

 PICRIS, Oxtongite Calix double, the inner equal, the outer 



lax ; receptacle naked ; seed transversely grooved ; down 



feathered. 

 SONCHUS, Sow Thistle Calix imbricate, ventricose; down 



hairy; receptacle naked. 

 LACTUCA, Lettuce Calix imbricate, cylindrical, with a mem- 



branaceous margin; receptacle naked; seeds even, with 



a simple stipulate down. 

 CHONDUILLA, Gum Succory Calix calicled ; floscules in 



many rows ; seeds muricated ; pappus simple, stipulated. 

 PRENANTIIES Calix calicled; florets in a simple row; 



pappus simple, subsessile; receptacle naked. 

 LEONTODON, Dandelion Calix imbricate, with loosish scales ; 



down capillary; receptacle naked, dotted. 

 HIERACIUM, Hawkweed Calix imbricate, or caliculate, 



ovate ; down simple, sessile ; receptacle naked. 

 CREPIS, Bastard Hawkweed Calix calicled, with deciduous 



scales; down hairy, stipitate ; receptacle naked. 

 ANDRVALA, Downy Sow Thistle Receptacle villose; calix 



many-parted, subequal, rounded; down simple, subsessile. 

 HYOSERIS, Yellow Eye Calix almost equal; down hairy 



and calicled ; receptacle naked. 

 SERIOLA Calix simple; pappus subplumose; receptacle 



chaffy. 



HYPOCHCERIS Calix subimbricate ; down feathered; recep- 

 tacle chaffy. 

 LAPSANA, Nipplewort Calix calicled, each of the inner 



scales channelled ; receptacle naked. 

 CATANANCHE Receptacle chaffy; calix imbricate; down 



awned, from a five-bristled calix. 

 CICIIORIUM, Succory or Endive Calix calicled; pappus 



slightly five-toothed, obscurely hairy ; receptacle some- 

 what chaffy. 

 SCOLYMUS, Golden Thistle Calix imbricate, spiny ; pappus 



none; receptacle chaffy. 



2. Such as hai-e tubulous compound Flowers. 



ARCTIUM, Burdock Calix globular, the scales furnished at 

 the end with inflected hooks. 



SERRATULA, Sawwort Calix subcylindrical, imbricate, awn- 

 less ; receptacle chaffy or hairy ; seed-down feathery or 

 toothed. 



CARDUUS, Thistle Calix ovate, imbricate with spiny scales ; 

 receptacle hairy. 



CNICUS, Blessed Thistle Calix ovate, imbricate with branch- 

 thorn scales, guarded with bractes ; corollets equal. 



ONOPORDUM, Cotton Thistle Scales mucronate ; receptacle 

 honey-combed. 



CYNARA, Artichoke Calix dilated at the base, imbricated 

 with somewhat fleshy scales ; receptacle more or less 

 thick and fleshy. 



CARLINA, Curline Thistle Calix radiated with long, 

 coloured, marginal scales. 



CARTHAMUS, Bastard Saffron, or Sufftower Calix ovate, 

 imbricate with scales, which at the end are subovate- 

 foliaceous. 



BIDENS, Water Hemp Agrimony Calix imbricate; corolla 

 sometimes, but seldom, with a floscule or two in the ray; 

 seed crowned with erect scabrous awns ; receptacle 

 chaffy. 



CACALIA, Alpine Colt's Foot Calix cylindrical, oblong, at 

 the base only subcalicled ; down capillary ; receptacle 

 naked. 



ATRACTYLIS, Distaff Thistle Corolla radiated; corollules 

 of the ray five-toothed. 



EUPATORIUM, Hemp Agrimony Receptacle naked ; down 

 rough or feathery; calix imbricated, oblong; style pro- 

 minent, cloven half way down, divaricated. 



AGERATUM, Bastard Hemp Agrimony Receptacle naked; 

 down five-awned; calix oblong, subequal; corollets 

 quadrifid. 



ETHUHA Receptacle naked; seed-down none; florets 

 tubular, five-cleft, numerous; scales of the calix pointed. 



STJEIIELINA -Anthers tailed; down branched; receptacle 

 with very short chaff's. 



CHRYSOCOMA, Goldy Locks Calix hemispherical, imbricate; 

 style scarcely larger than the florets; pappus simple; re- 

 ceptacle naked. 



CALEA, Halbert Weed Calix imbricate; down hairy, or 

 none; receptacle chaffy. 



TARCIIONANTHES, African Fleabane Calix one-leafed; 

 commonly half-seven-cleft, turbinate; seeds covered with 

 down ; receptacle villose. 



PTERONIA Receptacle with many-parted bristles; down 

 subplumose ; calix imbricate. 



ATIIANASIA, Cotton-weed Calix imbricate; down chaffy, 

 very short ; receptacle chaffy. 



SPILANTHUS Calix almost equal; down two-awned ; re- 

 ceptacle conical, chaffy. 



SANTOLINA, Lavender Cotton Ca\\\ imbricate, hemispheri- 

 cal ; down none; receptacle chaffy. 



BARNADESIA Calix naked, imbricate, pungent; corolla 

 radiate; down of the ray feathered, of the disk bristly, 



broken backwards. 



********** 



APARGIA Calix subimbricate, with linear, parallel, un- 

 equal scales; down plumose, subsessile; receptacle naked, 

 subvillose. 



ARTEMISIA, Southernwood and Wormwood Receptacle sub- 

 villose, or almost naked ; down none; calix imbricate with 

 rounded converging scales ; corolla of the ray none. 



BORKHAUSIA Calix caliculate, at length, in seed, sul- 

 cately-costate, exterior scales or calicle loose ; receptacle 

 naked ; pappus stipitate, pilose. 



HEDYPNOIS Calix calicled with short scales; seeds 

 crowned with the calicle; outer without down, covered up 

 in the scales of the calix ; inner having a down of five erect- 

 ish awned chaflfe ; receptacle naked, hollow, and dotted. 



