PRIMULA 



PRIMULA 



2785 



INDEX, COXTIXCED. 



KEY TO THE SECTIONS OR GROUPS. 



I. Plants of hybrid origin, of many kinds, more or 



less in cult. I. HYBRIDS, p. 2786. 



II. Plants of specific difference, representing wild or 



native species of Primula. 

 A. Young hs. involute (edges turned inward), 



B. Lts. mostly thick or coriaceous: fls. umbellate: 

 bracts of involucre usually not If. -like 



II. AURICULA, p. 2787. 



BB. LTS. thin or membranaceous: fls. in super- 

 imposed whorls or Terticels: bracts of involucre 

 leafy. III. FLORIBCN-D.E, p. 2791. 



AA. Young Its. retolute (edges turned backward). 



B. Lrs. lobed and distinctly petioled, the lobes den- 

 tate or crenate. IV. SIXENSES, p. 2791. 

 BB. LTS. not lobed or only indistinctly so. 



C. Calyx leafy, strongly accrescent (increasing in 



size) after flowering. V. MONOCARPIC.E, p. 2795. 

 CC. Calyx little or not leafy or accrescent: plant 



stoloniferous. VI. MIXUTISSI>LE, p. 2796 



CCC. Calyx as in cc.: plant not stoloniferous. 

 D. Fl. solitary on a bractless scape. 



VII. OMPHALOGBAMMA, p. 2796. 

 DD. Fls. usually many (sometimes solitary) on 



a bracted scape. 



E. Foliage usually pilose or pubescent. 

 F. Blossoms distinctly pedicellate (each 



one on a stalk). 

 G. Lf. -texture coriaceous or nearly so, 



strongly rugose. 

 H. Length of Its. 4 in. or less. 



VIII. BULLAT.E, p. 2796. 

 HH. Length of ITS. 4 in. or more. 



IX. CAROLIXELLA, p. 2797. 

 OG. Lf.-texture thin or membranaceous, 



rugose. 

 H. Base of If. -blade cordate; petiole 



distinct. X. FALLACES, p. 2797. 



HH. Base of If. -blade usually atten- 

 uate into a petiole. 



XI. VERNALES, p. 2797. 

 FF. Blossoms sessile or very short-pedi- 

 cellate. 

 G. Bracts of involucre short and broad. 



XII. SOLDAXELLOIDE-E, p. 2799. 



GG. Bracts lanceolate or subulate. 



XIII. CAPITATE, p. 2800. 

 ZE. Foliage usually glabrous or only 



minutely pubescent. 

 F. Bracts of involucre gibbous or saccate 



at base. XIV. FABIXOS.E, p. 2801. 



FF. Bracts not gibbous or saccate. 



G. Base of If. -blade cordate; petiole 



distinct: caps, cylindrical. 

 H. Corotta funnelform. 



XV. CORDIFOLLE, p. 2804. 

 HH. Corolla cylindrical. 



XVI. SREDDfSKYA, p. 2804. 



GG Base of If .-blade gradually narrowed 



into petiole: caps, globose. 

 H. Umbel 12-fld.: hs. somewhat 

 coriaceous: plants low, some- 

 times very small. 



XVII. TEXELLJE, p. 2804. 

 HH. Umbel several- to many-fld.: 

 hs. either petioled or narrowed 

 i',ito a winged base, the midrib 

 very wide: plant mostly low, 

 but scape sometimes long. 



XVIII. PETIOLARES, p. 2805. 

 Umbel several- to many-fld.: 



plant tall. 



i. Blossoms pedicellate, in super- 

 posed umbels: Ins. mem- 

 branaceous or papery, ser- 

 rulate or denticulate. 



XIX. CAXKRIEXIA. p. 2805. 

 n. Blossoms very short-pediceUed 

 or nearly sessile, mostly in 

 simple umbels: Ivs. usually 

 coriaceous, obtusely dentic- 

 ulate. XX. CALLIAXTH^, p. 2807. 



