KEY. 267 



Scales of the aments entire. Xo cup-shaped, 

 perianth-like disk 874 



874. Sterile flowers ; stamens 1, 2, 3-6, with 1 or 2 little 

 glands at the base. Fertile flowers with a flat gland at the 

 base of the ovary. Style short, or wanting ; stigmas 2. 

 Pod 2-valved, at length revolute at the summit. Seeds 

 clothed with woolly down. Salix, Tourn. 



Glands none at the base of the stamens or the 

 ovary. Sterile aments oblong ; stamens 2-8, sliorter than 

 the scales. Fertile aments ovoid. Ovary surrounded by 3 

 scales at the base. Stigmas 2, thread-form. Nutlet (dry 

 drupe) 1-seeded, studded with resinous grains or wax. 

 Leaves (and aments) resinous-dotted. Myrica, L. 



875. (840.) Many flowers in a common calyx-like invo- 

 lucre, or head. Anthers united into a ring. 



Baccharis (927) and.Antennaria (930). 

 No common, calyx-like involucre to several flow- 

 ers. Anthers not united 876 



876. Flowers, at least one sort of them, with a double 

 perianth, a calyx and a (usually colored) corolla 877 



Flowers with a simple, herbaceous, or colored 

 perianth (which rarely consists of 2 pales only), or naked 

 (and. then sometimes covered by a glume) 887 



877. Corolla polypetalous 879 



Corolla gamopetalous, funnel-form or salver-shaped. 



Stamens 3 or 4 878 



878. Stamens 4. Calyx of 4 imbricated, scarious-mar- 

 gined sepals. Corolla salver-form, with the limb 4-parted. 

 Sterile flowers with the anthers on long capillary filaments, 

 and the corolla-lobes reflexed, or spreading. Fertile flowers 

 with minute anthers on short filaments, and. the corolla 

 closed over the fruit in form of a beak. Stamens 4. Style 

 1. Pod opening by a transverse line. Flowers whitish, 

 small, in a bracted, dense spike, or in clusters, or scattered. 



(354) Plantago. 



Stamens 3. Style slender ; stigmas 1-3. Limb of 



the calyx of several plumose bristles (like a pappus), at first 



involute, at length unrolled. Corolla funnel-form, gibbous 



above the base, with the limb 5-lobed. Fruit indehiscent. 



