CLASS XVIII. ORDER V. 



61 



Platan'^thera. Corolla vaulted ; lips 

 narrow, entire, spuiTed at the base ; cells 

 i)f the anther widely divided at the base by 

 the broad interposed stiyma ; poUiuia pedi- 

 celled ; glands of the pedicels naked. 



Hauena'kia. Corolla ringent ; lip spur- 

 red at the base beneath ; stripes of the pol- 

 nnia widi naked and distinct glands ; cells 

 of the stalks adnate, or separated. 



B. A7ifher pm-allel with the stigma, 7iot 

 caducous ; masses of pollen affixed, to the 

 summit of the stigma, and made up of 

 farinaceous or angular particles. 



Goodye'ra. Corolla, ringent-like, the 

 lo\ver petals placed under the gibbous lip, 

 which is divided above ; style free ; con- 

 stituent particles of the masses of pollen an- 

 gular, (rattlesnake-leaf, scrophula weed.) 



Neot'^tia. Corolla ringent, the 2 lower 

 petals placed beneath the hp, which is 

 beardless, interior j)etals converging ; style 

 wingless ; pollen farinaceous. 



Liste'ra. Corolla irregular ; lip 2-lobed, 

 sessile, with no calli ; column apterous ; an- 

 ther fixed by the base, (twayblade.) 



Crani'chis. Corolla 5-petalled, resupi- 

 nate, sub-ringent lip, vaulted behind. 



C. Anther inserted, terminal, not cadu- 

 cous ; masses of pollen farinaceous or 

 angular. 



Pogo'nia- Petals 5, distinct, without 

 glands ; lip sessile, cowled, crested inter- 

 nally ; pollen farinaceous, (snake-mouth.) 



Cymbid^'ium. Petals 5, di.stinct; lip be- 

 hind, or inverted, unguiculate ; the lamina 

 bearded ; style free ; pollen angular, (grass 

 pink.) 



•Arethu'sa. Petals 5, connate at the 

 base ; lip below growing to the style, cowl- 

 ed above, crested within ; pollen angular, 

 (arethusa.) 



Tripho'ra. Petals 5, distant, equal and 

 connivent, without glands ; lip unguiculate, 

 cucuUate ; column spatulate, fiatteued, ap- 

 terous, (three-bird-orchis.) 



Tipula'ria. Segments of the perianth 

 spreading ; lip entire, sessile, with a con- 

 spicuous spur at the base beneath ; column 

 or style without wings, lengthened, free ; 

 anthers resembling a lid, permanent ; poUi- 

 nia (or masses of pollen) 4, parallel, (limo- 

 dore.) 



Lipa'ris. Malax'-'is. Corolla spreading ; 

 petals 5 ; lip flat, expanded, entire, turned 

 various ways ; column or stjde winged ; 

 poUinia 4, parallel, aflixed to the summit of 

 the stigma. 



Micros"tylis. Lip flat, sagittate or deep- 

 ly cordate ; column very small, round ; pol- 

 linia 4, loose. 



CoRALLORHi'ZA. Lip produced behind, 

 adnate with the spur, or free ; poUinia 4, 

 oblique, not parallel, (coral-root.) 



Aplec^trum. Lip unguiculate, not pro- 

 duced at the base ; antlier below ihe sum- 

 mit of the colunm ; poUinia 4, oblique, lens- 

 like. 



Calyp^so. Segments of the perianth as- 

 cending ; petals 1-sidcd i lip ventricose. 



spurred beneath, near the end ; column pet 

 aloid, dilated ; poUinia 4. 



Epiden"drum. PoUinia 4, parallel, each 

 mass ■v\'ith an clastic filament at the base ; 

 style united with the claw of the lip into 8 

 tube. (vanUla plant.) 



ORDER II. DIANPRIA. 



Cypripe'dium. Calyx colored, 4-leaved, 

 spreading ; corolla (by some the calyx is 

 called a coroUa) ; nectary large, hollow, in- 

 flated ; style withatcraiinallobe, and petal- 

 like appendage on the upper side, (ladies' 

 slipper.)* 



ORDER V. PENTANDRIA. 



Plants bearing seeds in follicles, and pollen 

 in masses called poUinia. 



Ascle'pias. Petals 5, reflexed ; nectaries 

 5, concave, erect, containing little horns ; 

 each stamen with a pair of pendulous mas- 

 ses of pollen suspended from the top of the 

 stigma; follicle smooth, (milk- weed, sUk 

 weed.)t 



Apoc"yNUM. Corolla bell-form ; stamens 

 with converging anthers, proceeding from 

 the middle of the stigma, and alternating 

 with 5 nectaries ; stigma thick, almost ses- 

 sile ; follicles in pairs, long, linear, (dog- 

 bane, Indian hemp.) 



Acera'tes. Corolla reflexed ; 5 concave, 

 short nectaries ; each stamen with a pair of 

 pendulous masses of poUen ; follicle smooth ; 

 corolla with purple tips, much longer than 

 the calyx. 



EchVtes. Follicles 2, distinct, terete, 

 seed crowned with a pappus ; corolla fun- 

 nel-shaped, ^vith the border 5-parted ; an- 

 thers adhering in the middle to the stigma ; 

 scales 5, fleshy, surrounding the base of the 

 genu. S. 



Gonolo'bus. CoroUa wheel-form, 5-part 

 ed ; nectary cylindric, fleshy, 5-lobed ; an- 

 thers opening transversely, terminated by a 

 membrane ; poUinia 5 pairs, not separating 

 izito grains ; stigma flat ; follicle 2, ventri- 

 cose ; seeds comose. (false choke-dog.) 



Podostig"ma. Stigma on a stipe ; mas- 

 ses of pollen 10, smooth, pendulous ; nec- 

 tary 5-leaved ; leaves compressed ; corolla 

 bell-form ; foUicles smooth. jS. 



Periplo'ca. Calyx 5-cleft; corolla ro- 

 tate, 5-parted ; orifice surrounded with an 

 urceolate crown, terminating in 6 filiform 

 awns ; style 1 ; stigma 5-comered ; poUinia 

 solitary, composed of 4 grains ; follicles 2 

 divaricate, (milk-vine.) 



Amso'nia. Follicles 2, erect; coroUa fun 

 nel-shaped, with the throat closed ; seeds 

 terete, naked, with the summit obliquely 

 truncate. 



Hoy'a. Corolla 5-cIeft; pollen masses 

 fixed by the ba.se, conniving, compressed , 

 stigma depressed with an obtuse wart ; foL 

 licles smooth : seeds concave. Ex. 



* The ladies' slipper of the garden belongs 

 to the genus Irnpatiens, of the class Pentan 

 dria. 



t The peiiera in this order are, by many bot- 

 anists, placed in the class Pcntandria 



