CISTACEiE. 203 



Plate 87. 

 HELIANTHEMUM, Town. 



Petala 5, ephemera, asstivatione pi. m. corrugata. Stamina 

 indefinita. Capsula imilocularis, 3-valvis, pleio-oligosperma. 

 Semina orthotropa. Embryo circinatus, circumflexus, vel 

 uncinatus. — Herbas vel siiffruticuli. 



Helianthesium, Toum. Inst. p. 248. 1. 128. Grertn. Fr. 1. 1. 76. Michx. 

 Fl. 1. p. 308. Dunal, in DC. Prodr. 1. p. 266. (excl. plur.) 

 Spach, in Ann. Sci. Nat. ser. 2. 6. p. 360 (cum Croeanthenio). 

 Endl. Gen. 502!). (excl. spec.) 



Cisti Sp., Linn. etc. 



Subgen. Heteromeris. — Flores majusculi 5-petali et po- 

 lyandri, cum parvulis apetalis saspiusve cryptopetalis 3 — 10- 

 andris plerumque in eadem stirpe mixti. — Herbas perennes, 

 foliis alternis vel suboppositis exstipulatis. 



Heteromeris, Spach, in Ann. Sci. Nat. I. c.& inComp.Bot. Mag. 2. p. 200. 

 Helianthemi Sect. Lecheoipes, Dunal, in DC. I. c. p. 269. 



Rock-rose. Frost-weed. 



Calyx herbaceous, persistent : sepals 5, of which the two 

 exterior are much smaller or minute and rather to be regard- 

 ed as bractlets ; the three proper sepals equal, convolute in 

 aestivation. Petals 5, hypogynous, unsymmetrically placed 

 as respects the sepals, more or less crumpled and convolute 

 in the contrary direction from the sepals in aestivation, 

 spreading, rounded or dilated-cuneiform, equal, expanding in 

 sunshine for a single day, then caducous. Stamens indefi- 

 nite, hypogynous, all fertile, caducous: filaments filiform, 

 distinct : anthers introrse or innate ; the cells opening lon- 

 gitudinally. Ovary ovoid, one-celled with three parietal 

 placentae, or incompletely three-celled by their projection : 

 style articulated with the summit of the ovary, or very 

 short or wanting : stigma capitate, three-lobed or three- 

 crested. Ovules orthotropous, nodding or recurved on as- 

 14* 



