976 



POLEMONIACEAE 



f^VMiLY 5. POLEMONIACEAE Yeut. Phlox Family. 



Auuual or usually perennial herbs or shrubby plants. Leaves alternate or 

 opposite, often crowded : blades entire or pinnately compound. Inflorescence 

 paniculate, corymbose, sometimes clustered. Flowers perfect, regular or nearly 

 so. Calyx of 5 partially united sepals. Corolla regular : limb live-lobed : lobes 

 convolute in aestivation. Androecium of 5 often unequal stamens adnate to 

 the corolla-tube. Anthers opening lengthwise and introrsely. Gynoecium of a 

 single carpel. Ovary 3-celled with a thick axis. Styles united. Stigmas 8. 

 Ovules solitary, erect, anatropous, or several in two series, ascending, amphitro- 

 pous. Fruit a 3-celled loculicidal capsule : valves usually separating from the 

 central axis to which the seeds are attached. Seeds solitary or several in each 

 cavity, with a spongy or mucilaginous testa. Endosperm fleshy or horny. 

 Embryo straight, axile. 



Calyx-tube distended and ruptured by the capsule at maturity. 



Corolla salverform : leaves opposite ; blades entire. 



Corolla funnelform or rotate (in our species) : leaves often alternate ; blades 

 commonly pinnatifld. 

 Calyx-tube neither distended nor ruptured at maturity. 



1. Phlox. 



2. GiLIA. 



3. POLEMONIIM. 



1. PHLOX L. 



Annual or usually perennial, sometimes shrubby herbs, with erect or diffuse and creep- 

 ing stems. Leaves opposite, or sometimes alternate above : blades entire. Flowers in 

 terminal corymbose or panicled cymes. Calyx pedicelled : tube narrow, 5-ribbed : lobes 

 5, often tooth-like. Corolla white, blue, purple or red, salverform : tube slender : lobes 

 spreading, obovate to orbicular, orobcordate. Stamens 5, included. Filaments, unequally 

 adnate to the corolla-tube. Ovules 1—5 in each cavity. Capside included in the calyx- 

 tube which it ruptures at maturity. Seeds sometimes narrowly winged, not emitting spiral 

 threads when wetted. 



Calyx-lobes fully as long as the tube or much longer. 

 Annual plants. 



t'oroUa-tube not surpassing the calyx, glabrous : ovules 4 or 5 in each cavity. 

 Corolla-tube surpassing the calyx, pubescent : ovule 1 in each cavity. 

 Leaves mostly alternate ; blades thin. 



Stems mostly less than 10 cm. long : leaf-blades narrowed at the base : 



corolla-lobes about 6 mm. long. 

 Stems mostly over 10 cm. long : leaf-blades broadest at the base : 

 corolla-lobes about 10 mm. long. 

 Leaves mostly opposite ; blades thick. 



Stems villous-hirsute : leaf-blades bristly : capsules oblong. 

 Stems scabrous-pubescent : leaf-blades slightly pubescent : capsules 

 subglobose. 

 Perennial plants. 



Plants with prostrate or creeping sterile^shoots. 



Leaf-blades of thelsterile shoots of a spatulate type, petioled. 

 Leaf-blades of the sterile shoots oftan elliptic or oblong type, sessile. 

 Plants without prostrate or creeping sterile shoots. 

 Calyx-lobes linear-subulate, the tips not bristle-like. 



Cymes compact, invoUicrate : capsules less than 4 mm. long. 

 Upper leaves with blunt or merely acute blades. 

 Upper leaves with somewhat acuininate blades. 

 Cymes open, not involucrate : capsules fully 5 mm. long. 

 Calyx-lobes with bristle-like tips. 



Calyx copiously pubescent : branches of ithe inflorescence closely pubes- 

 cent. 

 Calyx glabrous or nearly so : branches of the inflorescence glabrous or 

 with few scattered "hairs. 

 Calyx-lobes shorter than the tube, sometimes apparently longer by the splitting of 

 the sinuses. 

 Stems prostrate, spreading, forming large mats. 



Leaves little if at all clustered : corolla-lobes cleft to the middle or below it. 

 Leaves conspicuously or densely clustered : corolla-lobes entire or notched. 

 Calyx 4-6 mm. long : plants forming dense mats. 



Upper.part of plant glandular : corolla-lobes deeply notched. 

 Upper part of plant not glandular: corolla-lobes shallowly notched. 

 Calyx 8-10 mm. long : plants not in dense mats. 

 Stems erect or ascending, not forming mats. 



A. Calyx-lobes lanceolate, subulate-lanceolate or nearly triangular, 

 a. Calyx-lobes i.'; or y.l as long as the tube. 



Upper leaf-blades with broadly rounded or cordate bases ; lower leaves 



with petioled blades. 17. P. ovata. 



Upper leaf-blades obtuse or acute at the base ; lower leaves with sessile 



blades. 18. P. f/laherrinia. 



1. P. Eoemeriana. 



2. P. tenuis. 



3. P. Drummondu. 



4. P. villosiHSima. 



5. P. aspera. 



6. P. fcptaiis. 



7. P. divaricata. 



8. P. amoena. 



9. P. Lighthipei. 

 10. P. Fioridana. 



11. P. pilom. 



12. P. ddonsa. 



13. P. bijidd. 



14. P. BnUonii. 



15. P. suhulata. 



16. P. Hrntzii. 



