DIDYNAMIA. 



(32) 



TETRADYNAMIA. 



ALECTRA Corolla bell-shaped ; filaments bearded ; capsule 

 two-celled. 



BROWALLIA Calix five-toothed ; corolla, border five-cleft, 

 equal, spreading, with the navel closed ; anthers, two 

 larger; capsule one-celled. 



CITHAREXYLUM, Fiddlewood Calix five-toothed, bell-form ; 

 corolla funnel-wheel-form ; segments above villose, equal ; 

 berry two-seeded ; seeds two-celled. 



COLLINSIA Calix five-cleft; corolla bilabiate, orifice closed, 

 upper lip bifid, lower trifid ; capsule globose, partly one- 

 celled, and imperfectly four-valved ; seeds two or three, 

 umbilicate. 



CONOPEA Calix five-cleft; corolla ringent, two-lipped, 

 lower lip trifid ; stigma two-lobed ; capsule one-celled, 

 four-valved, many-seeded. 



CYRILLA Calix superior, five-leaved, linear-lanceolate ; 

 corolla declined, funnel-form; tube cylindric, gibbous on 

 its lower edge; throat tricoccous ; border inclined, five- 

 parted; segments roundish, the three lower more produced ; 

 filaments inserted into the margin of the corolla, incurved, 

 with a fifth barren; anthers cohering; germen inferior, 

 half-emerging, with a nectareous lid ; style bent down ; 

 sligma two-lobed ; capsule half-two-celled, with two- 

 parted receptacles ; seeds numerous. 



HERPESTIS Calix five-cleft, unequal, bibracteate at the 

 base; corolla tubular, subbilabiate ; stamens included, all 

 fertile ; capsule two-valved, two-celled. 



LINNJEA Calix double, of the fruit two-leaved, of the flower 

 fire-parted, superior; corolla bell-shaped; berry dry, 

 three-celled. 



MAURANDIA Calix inferior, in five deep segments; corolla 

 ringent; tube bell-shaped, furrowed; capsule of two cells, 

 opening by five teeth at their summit. 



MELIANTHUS, Honey-flower Calix five-leaved, the lower 

 leaf gibbous ; petals four, with the nectary within the 

 lowest. 



MYOP<?RUM Calix five-parted ; corolla bell-shaped, with a 

 spreading, almost equal, five-parted border; berry one or 

 two seeded ; seeds two-celled. 



OHTHOCARPUS Calix tubular, semiquadrifid; corolla bila- 

 biate, closed; upper lip smaller, compressed, with the 

 margin inflected ; lower concave, obsoletely three-toothed, 

 unexpanded; anthers unconnected, lobes unequal, divari- 

 cate; capsule straight, elliptic-ovate, two-celled, two- 

 valved, many-seeded, opening on both sides; seeds small, 

 with an alated lunate margin. 



PENTSTEMON Calix five-leaved ; corolla bilabiate, ventri- 

 cose; rudiment of a fifth stamen, bearded above; capsule 

 two-celled. 



RUSSELIA Calix five-leaved, setaceous at the end ; corolla, 

 tube very long, hairy at the throat, border two-lipped, 

 lower lip trifid ; capsule acuminate, one-celled, two-valved, 

 many-seeded. 



SEYMERIA Calix five-parted nearly to the base; corolla 

 rotate-campanulate, almost equally five-lobed ; stamens 

 scarcely unequal, subsessile, inserted near the orifice; 

 anthers oblong, naked; style declinate; capsule ventri- 

 cose, ovate, acute, two-celled, two-valved, opening at the 

 summit. 



SIBTHORPIA, Moneywort Calix five-parted; corolla five- 

 parted, equal ; stamens in remote pairs ; capsule com- 

 pressed, orbicular, two-celled, with the partition trans- 

 verse. 



SPIELMANNIA Calix five-cleft; corolla bearded at the 

 throat, with a five-celled almost equal border; drupe with 

 a two-celled tuberculated nut. 



TANJECIUM Calix cylindrical, truncate; corolla tubular, 

 almost equal, five-cleft; rudiment of a filth filament; 

 berry corticose, two-celled, many-seeded. 



TOURRETTIA Calix two-lipped ; corolla, lower lip none, 

 but two toothlets instead of it; capsule echinated, four- 

 celled, two-valved. 



ZAPANIA Flowers capitate; calix five-toothed; corolla five- 

 lobed ; stamens four, fertile ; stigma peltately capitate, 

 oblique; seeds two, at first covered by an evanescent 

 utriculus. 



CLASS XV. TETRADYNAMIA. 



Consisting of Plants having six Stamens in each Flower 

 four long and two short. 



1. SILICULOSA. 



(The character of this Order consists in the silicula, or pod, 

 being broad and globular; that is, a roundish flat seed- 

 vessel, furnished with a style, which is frequently as 

 long as the seed-vessel itself.) 



MYAGRUM, Gold of Pleasure Silicle terminated by a coni- 

 cal style, with a cell commonly one-seeded. 



VELLA, Cress Rocket Silicle with a partition twice as large 

 as the valves, ovate on the outside. 



ANASTATICA, Rose of Jericho Silicle retuse, crowned at the 

 edge with valves twice as long as the partitions ; style in- 

 termediate, pointed, oblique; cells one-seeded. 



SUBULARIA, Awlwort Silicle entire, ovate; valves ovate, 

 concave, contrary to the partition ; styles shorter than the 

 silicle. 



DRABA, Whitlow Grass Silicle entire, oval-oblong; valves 

 flattish, parallel to the dissepiment; style none. 



LEPIDIUM, Pepperwort and Cress Silicle emarginate, cor- 

 date, many-seeded ; valves keeled, contrary. 



THLASPI, Bastard Cress and Shepperd's Purse Silicle 

 emarginate, obcordate, many-seeded ; valves boat-shaped, 

 margined, and keeled. 



COCIILERIA, Scurvy Grass Silicle emarginate, turgid, sca- 

 brous ; valves gibbous, obtuse. 



IBEHIS, Candy-tuft Corolla irregular, with the outer petals 

 larger; silicle emarginate, many-seeded, (in some species, 

 one seed only in each cell.) 



ALYSSUM, Madwort The shorter filaments marked with a 

 toothlet; silicle emarginate. 



PELTARIA Silicle entire, suborbiculate, compressed, flat, 

 not opening. 



CLYPEOLA, Treacle Mustard Silicle emarginate, orbiculatc, 

 compressed, flat, deciduous. 



BISCUTELLA, Buckler Mustard Silicle compressed, flat, 

 rounded above, and below two-lobed ; calix leaflets gib- 

 bous at the base. 



LXINARIA, Moonwort,or Honesty Silicle entire, elliptic, com- 

 pressed, flat, pedicelled ; valves equal, and parallel to the 

 partition, flat; calix with bagged leaflets. 



CAKILE, Sea Rocket Silicle sublanceolate, four-angled, 

 biarticulate, separating at the articulation ; articulations 

 dissimilar, the lower emarginate, one-seeded, and valveless. 



CORONOPUS, Wart Cress Silicle reniform, compressed, and 

 corrugated ; cells valveless, one-seeded. 



ISATIS, Dyer's Woad Silicle lanceolate, one-celled, one- 

 seeded, deciduous, bivalve; valves navicular. 



