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+===== americana =====
+===== Campanula americana =====
+ L.
+{clear}
+Tall. B
+{clear}
+===== Twitter =====
+For regular additions, follow via Twitter **@Klokjesbloem** {https://twitter.com/@Klokjesbloem}[{{:twitter.png?50|}}]
+{clear}
+===== Habitus =====
+Erect, simple or few-branched annual or biennial, to 6 ft., glabrous or pubescent.
+{clear}
+[{{:campanula:tn_c.americana.jpg?200|Campanula americana flowering - Foto and drawing Herman Berteler}}]
+[{{:campanula:tn_c.americana_3.jpg?200|Campanula americana to run to seed - Foto and drawing Herman Berteler}}]
+{clear}
+Morphological simularities of these taxa to other Nort American Campanulideae may be due to convergence; consequently, the relationships of these four species (//Campanula angustifloar//, //Campanula exigua//, //Campanula sharsmithiae// and //Campanula griffinii//) are obscure.
+{clear}
+===== Leaves =====
+Stem leaves lanceolate to ovate-elliptic, to 6 in. long, narrowed at both ends, serrate.
+{clear}
+[{{:campanula:tn_c.americana_1.jpg?300|Campanula americana - Foto and drawing Herman Berteler}}]
+{clear}
+===== Flowers =====
+Flowers 1-3 in the axils, in long spikes, calyx lobes linear, to ¾ in. long, corolla blue or white, to 1 in. across, rotate, style 3-lobed.
+{clear}
+Pantoporate pollen in //Campanulaceae// has previously been known only from //Campanula americana// (Dunbar, 1975). (( :ref:nancymorin01 ))
+{clear}
+[{{:campanula:tn_c.americana_4.jpg?300|Campanula americana - Foto and drawing Herman Berteler}}]
+{clear}
+===== Pollen =====
+Most European //Campanula// pollen studied to date is 3- to 4-porate (Dunbar, 1975). Most North American //campanulas// (and other North American genera in //Campanuloideae//) have pollen that is 5- to 6-porate, the pores equatorial )Chapman, 1966; Chuang, pers. comm., 1978; Morin, unpubl. data). Only //Campanula americana// L., //Campanula exgua//, and //Campanula griffinii// are known to have pantoporate pollen, although pores of //Campanula reverchonii// are not strictly equatorial. Small (1903) placed //Campanula americana// in the monotypic genus //Campanulastrum//, and Gadella (1964) supported this decision. There is little morphological similarity between //Campanula americana// (which is a tall, broadleaved annual or biennial with spicate inflorescences and rotate corollas) and the annual California //campanulas//. Therefore it seems likely that pantoporate pollen evolved independently in these two groups.(( :ref:nancymorin01 ))
+{clear}
+===== Chromosomes =====
+Only one other //Campanula//, //Campanula americana//, which is a virgate annual or biennial, is known to have pantporate pollen.(( :ref:nancymorin01 ))
+{clear}
+===== Fruit =====
+Kapsel nahe der Spitze, seltener etwas oberhalb der Mitte sich offnend, 3facherig. Kelchbuchten ohne Anhangen. Sect. II //Rapunculus// Boiss.(( :ref:aengler01 ))
+{clear}
+[{{:campanula:tn_c.americana_2.jpg?300|Campanula americana - Foto and drawing Herman Berteler}}]
+{clear}
+Seed available, in small quantity. (( :ref:alpinaresearch03 ))
+{clear}
+===== Living =====
+Moist, shady places.
+{clear}
+===== Origin =====
+Eastern North America